You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello. How can I serve you?

USER: Due to postpone of my board meeting I need to change my existing reservation so, can you please help in changing my reservation?

ASSISTANT: Sure. Can I know your name?

USER: My name is Carol Taylor.

ASSISTANT: Please wait a while.

USER: Sure.

ASSISTANT: Thanks for being waiting. We didnt found any reservation by this name.

USER: Not a problem, thank you for the information.

ASSISTANT: Thank you for consulting us.