Расшифровка записи

Security: Morning. I'm Thomas Richardson, the sports centre security. The lady at the reception said that your iPod's missing.
Jackie: Yes, that's right.
Security: Can I ask you a few questions?
Jackie: Sure. Go ahead.
Security: Your name is...?
Jackie: Jackie Lee.
Security: OK, Jackie, do you often visit our sports centre?
Jackie: Yes. My parents brought me to the centre three years ago and signed me up for the gym classes. Since then I've been coming here every Tuesday and Thursday and I never miss classes as the coach says that it's very important... not to miss...
Security: Right, but there are no morning gym classes today.
Jackie: Sometimes I come to the swimming pool, too. It doesn't happen very often — only when I have the time. Today is such a day — I have a morning off, so I decided to have a swim.
Security: Is it possible that you've forgotten your iPod somewhere in the centre? In the coffee bar or in the gym?
Jackie: No. I didn't use them today. I came to the centre quite early, bought a ticket to the swimming pool at the reception and went straight to the changing room and then to the pool. I haven't been either to the gym or to the bar. I left my iPod in the locker in the changing room but when I came back, it wasn't there.
Security: I see. Frankly speaking, I can't remember our visitors ever reporting stolen valuables; they often lose things, which are usually found and brought to the reception. However, this incident looks like a crime and we'll have to call the police I'm afraid. Jackie: Looks like that. Security: There's a special safe at the reception by the way. We strongly recommend that our visitors keep valuables and mopey there. The safe is free and available for all our visitors...
Jackie: Yes, I know about the safe, but neither my friends nor I ever use it. Maybe it's a bit careless but we've always left money, watches and phones in the changing rooms — nothing has ever happened.
Security: I'm calling the police.
Jackie: No, wait a moment. I think I can hear my iPod. It sounds like it's in the locker. Oh goodness, it's here in my boot. I put it inside the boot to not forget it.
Security: Fine. I'm glad you've found it.
Jackie: I'm really so sorry for all this trouble. My mum's right — I'm hopelessly absent-minded.
Security: It's OK.

Пояснение . Исходя из текста, единственным верным ответом является слово changing.

Ответ: changing.