You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: Myself Sandra Taylor. My airport codes was mismatched, so can you help me changing existing reservation.

ASSISTANT: Sure. Let me check. Sorry. There is no reservation on your name.

USER: Ok, that's fine. Thank you for your services.

ASSISTANT: Thank you for reaching us, have a nice day.