You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today from my end?

USER: I am looking to modify my destination airport code in the past reservation. Can you please help me to change the ticket details?

ASSISTANT: Sure, I am here to help me out. Please allow me a moment.

USER: Thank you for accepting my request. Ok, take your time.

ASSISTANT: May I know your name?

USER: My name is David Thompson.

ASSISTANT: Sorry, there is no active reservation your name in our data.

USER: It's ok, not a problem with that. Thank you for checking my ticket status.

ASSISTANT: Thank you for reaching us.

USER: You are welcome.