You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you today?

USER: I am Anthony Martin. I want to change my existing reservation. Could you help me with that?

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

USER: Sure.

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

USER: That's ok, no problem. Thank you.

ASSISTANT: Thank you for contacting us, have a nice day.