You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I assist you today?

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

ASSISTANT: Sure, may I know your name please?

USER: Sure, my name is Scott Collins.

ASSISTANT: Ok, please wait for a while.

USER: Ok, take your time. It's ok, thank you for the information.

ASSISTANT: Sorry, there was no reservation found with your given name.

USER: No problem, thank you.

ASSISTANT: Thank you for opting us.