You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I be of your address?

USER: My Business trip got postponed, will you help me to change my existing reservation?

ASSISTANT: Sure, please let me know your name to check the reservation status.

USER: Karen Smith is my name.

ASSISTANT: Wait a moment I will check and revert to you.

USER: Sure.

ASSISTANT: Thanks for waiting, we did not found any reservation by this name.

USER: Ok, thank you.