You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I am John Moore, I would like to change my reservation, can you help me?

ASSISTANT: Ok, please wait for a while let me check your reservation status.

USER: Sure, take your own time.

ASSISTANT: Thanks for your time, there is no reservation found in our database.

USER: It's ok, thanks for your information.

ASSISTANT: Welcome, have a good day.