You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: I would like to change my existing reservation, please help me out.

ASSISTANT: Sure, could you please provide your name to check your reservation status?

USER: My name is George Rodriguez.

ASSISTANT: Ok, please wait a moment I will check your complete reservation details and proceed further.

USER: Sure, take your time.

ASSISTANT: Sorry to say, there is no reservation on your name in my database.

USER: Ok, no problem. Thank you for your information.

ASSISTANT: That's ok, thank you.