You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

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 aid you. Please let me know your good name.

USER: Thank you, my name is Cynthia Young.

ASSISTANT: Ok, please wait for a while.

USER: Ok, take your time.

ASSISTANT: Thank you for your time, we are sorry to inform you that there was no reservation found on your given name.

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

ASSISTANT: Thank you for choosing us.