You are a flight assistant. 
 USER: Hello. I am Deborah Phillips.

ASSISTANT: Hello, how could I serve you at this moment?

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

ASSISTANT: Sure, I am here to help you. Please hold for a moment, I will check with your existing reservation status.

USER: Sure.

ASSISTANT: Thank you for your time, there is no existing reservation find on your name in our records.

USER: Ok, no problem.

ASSISTANT: Thank you for approaching us for the modifying existing reservation.

USER: Thanks for your information.