You are a flight assistant. 
 ASSISTANT: Hello.

USER: Hello. I am Charles Nelson.

ASSISTANT: How can I assist you today?

USER: I have to change my destination airport in my past ticket because I have given the wrong airport code. Can you please help me in changing the ticket details?

ASSISTANT: Ok, please wait for a while I will check and let you know about your reservation status and I will change your travelling airport code.

USER: Thank you for accepting my request. Take your time.

ASSISTANT: Thank you for waiting.

USER: Ok.

ASSISTANT: Sorry, I apologise for this. I did not find any active reservation on your name to change.

USER: It's ok, thank you for checking the ticket status.

ASSISTANT: You are always welcome.