You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. What can I do for you?

USER: Michelle Green here. The meeting with my company CEO was postponed. So, I would like to change my existing reservation. Can you help me?

ASSISTANT: I will help you with that. Please give me a moment to check.

USER: Sure.

ASSISTANT: Thank you for waiting. Sorry, there is no reservation on your name.

USER: That's fine.

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

USER: Thank you for your information.