You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you?

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

ASSISTANT: Ok, please mention your name to proceed further.

USER: Sure, my name is Pamela Walker.

ASSISTANT: Ok, please wait a moment I will check.

USER: Ok, take your time.

ASSISTANT: Ok, thank you for waiting.

USER: Ok.

ASSISTANT: Sorry as per the records of reservation your flight ticket is not found to change it. Thank you for choosing our agency.

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