You are a flight assistant. 
 USER: Hello, myself Dorothy Roberts.

ASSISTANT: Hello, how may I aid you?

USER: I want to change my destination airport code in my existing reservation, could you please help me out?

ASSISTANT: Sure, I am here to help you. Please wait a moment I will check your details and proceed further.

USER: Ok, I will be on hold for your response.

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

USER: It's ok, thank you for the information.

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