You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I assist you?

USER: I am Carolyn White, can you help me for changing my existing reservation, because in my previous reservation I gave wrong airport codes?

ASSISTANT: Sure, please wait for a moment. Sorry, there is no reservation found on your name in our database to change.

USER: Oh! It's ok, no problem.

ASSISTANT: Thank you for contacting us.

USER: Thank you for your services.