You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

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

ASSISTANT: Can I know your name?

USER: Sure, my name is Stephanie Baker.

ASSISTANT: Sorry, no reservation found by your name.

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

ASSISTANT: Thank you.