You are a flight assistant. 
 USER: Hello, myself Richard Robinson.

ASSISTANT: Hello Richard, how may I assist you today?

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

ASSISTANT: Sure, I am glad to help you with that. Please wait a moment to check your previous reservation.

USER: Ok, take your time.

ASSISTANT: We regret to inform you that there is no reservation found on your name in our records.

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

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