You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: My son is giving a presentation on international competition, but due to some sudden changes, I want to change my existing reservation.

ASSISTANT: Sure.

USER: Can you help me in this?

ASSISTANT: Let me check your reservation. Sorry.

USER: Check the details on Betty Harris.

ASSISTANT: There is no reservation on your name.

USER: That's ok.

ASSISTANT: Sorry for inconvenience.

USER: Thank you for your help.

ASSISTANT: Welcome.