You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you today?

USER: Due to postpone of my client meeting, I want to change my existing reservation.

ASSISTANT: Sure, we are here to help you. May I know your name?

USER: My name is Alexander Thomas.

ASSISTANT: Ok, wait for some time i will check and get back to you.

USER: Sure.

ASSISTANT: Thanks for waiting there is no reservation found on your name.

USER: Not an issue, thank you.

ASSISTANT: Thanks for approaching us.