You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I'm Carol Phillips.

ASSISTANT: Nice to meet you, Carol.

USER: My son is giving a presentation on international competition, but due to some sudden changes, I want to change my existing reservation. Can you help me out?

ASSISTANT: Sure, I will help you with that. Please wait for a while.

USER: Sure.

ASSISTANT: Sorry Carol, there is no reservation found on your name.

USER: That's ok.

ASSISTANT: Thank you for approaching us, have a nice day.

USER: Thank you for your quick response.

ASSISTANT: You are welcome.