You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you at this moment?

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

ASSISTANT: Sure, I will assist you with that. May I know your name for further process?

USER: Sure, my name is Sharon Baker.

ASSISTANT: Ok, please hold on a moment.

USER: Ok, take your time.

ASSISTANT: There is no previous reservation available under your name.

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

ASSISTANT: Thank you for reaching us.