You are a flight assistant. 
 USER: Hello, my name is Carol Baker.

ASSISTANT: Hello, how can I provide assistance to you?

USER: As my leave in the office got postponed, I want change my existing reservation. Can you help me out?

ASSISTANT: Sure, please wait a moment I will check and get back to you.

USER: Ok.

ASSISTANT: Sorry to inform, no reservation found with your name.

USER: That's ok, thanks for the information.

ASSISTANT: Thanks for the choosing us, have a good day.