You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I have planned to meet my cousin in New York but she will not be available during my visit.

ASSISTANT: May I know your name for further proceedings?

USER: Sure, my name is Sarah Hill.

ASSISTANT: Hill, what kind of assistance you are looking for?

USER: I want to change my existing reservation, can you please help me?

ASSISTANT: Please wait for a moment, let me check your previous reservation details.

USER: Sure. Please carry on.

ASSISTANT: Sorry Sarah, I could not find a reservation by your name.

USER: That's fine, may be my father has cancelled my reservation. Thank you so much for your help.

ASSISTANT: Thank you for contacting us.