You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you?

USER: As my business meet got postponed, I need to change my existing reservation. Can you help me with that?

ASSISTANT: Sure, may I know your good name please?

USER: My name is John Clark.

ASSISTANT: Please wait, I will check and get back to you.

USER: Sure.

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

USER: Ok, thanks for the information.

ASSISTANT: Thank you so much for communicating us.