You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help 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?

USER: Sure, my name is Sandra Wilson.

ASSISTANT: Please wait a moment.

USER: Ok, take your time.

ASSISTANT: Sorry to say, no reservation found with your name.

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

ASSISTANT: Thanks for reaching us.