You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: Michael Thomas here. Please help me out in changing my existing reservation.

ASSISTANT: Sure, please wait for a moment to check you reservation status.

USER: Sure.

ASSISTANT: No reservation found on your name in my database.

USER: That's ok, no issues.

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

USER: Thank you for your service.