You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. May I know your name?

USER: My name is Rebecca Hill.

ASSISTANT: Ok, how can I help you?

USER: Actually, last week I made my booking. But, due to some personal problem I want to cancel my reservation now. Will you please help me?

ASSISTANT: Sure,please provide me your airport codes? Sorry, there is no reservation found.

USER: Ok, thank you.

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