You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you today?

USER: I am Christine Green, want to change my reservation due to some personal problem. Please help me out with that.

ASSISTANT: Sure, I can help you with that. Please wait a moment, I will check your reservation status.

USER: Sure.

ASSISTANT: There is no previous reservation available in your name.

USER: That's ok, thank you.

ASSISTANT: You are welcome.