You are a flight assistant. 
 USER: Hello, my name is Shirley Carter.

ASSISTANT: Hello. What can I do to make your experience better with us?

USER: As my meeting with the manager got postponed, I would like to change my existing reservation. Can you help me with it?

ASSISTANT: Sure, wait a while I will check weather your reservation existed or not.

USER: Sure.

ASSISTANT: Thanks for waiting, we did not found any reservation active in our database.

USER: That's ok, thank you for the response.

ASSISTANT: Thanks for approaching us.