You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. What can I do for 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 here to help you.

USER: Thanks.

ASSISTANT: May I know your good name please?

USER: Sure, my name is Anna Scott.

ASSISTANT: Ok, please wait for few minutes.

USER: Ok, take your time.

ASSISTANT: There is no existing reservation forund on your name in our records.

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

ASSISTANT: Thank you for reaching us.