You are a flight assistant. 
 USER: Hello. I am Virginia Martin.

ASSISTANT: Hello, how can I help you?

USER: I need to change my existing reservation, Can you please help me with that?

ASSISTANT: Sure, I will help you in changing the previous reservation. Please wait for a while.

USER: Sure.

ASSISTANT: There is no reservation on your name in our records.

USER: Ok, no problem. Thanks for your information.

ASSISTANT: Thank you for approaching us.