You are a flight assistant. 
 USER: Hello, myself Carol Walker.

ASSISTANT: Hello, how may I aid you today?

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 help you.

USER: Thank you.

ASSISTANT: Please hold on.

USER: Ok, take your time.

ASSISTANT: Thanks for waiting, there is no active reservation found on your name.

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

ASSISTANT: Thank you for availing us.