You are a flight assistant. 
 USER: Hi, my name is Linda Allen.

ASSISTANT: Hi. How can I help you?

USER:  I want to cancel my reservation which I booked previously, so please can you help me?

ASSISTANT: Sure, just a second please.

USER: Please can you tell me whether there is any cancellation charge?

ASSISTANT: I am sorry Linda Allen, I cannot find any reservation on your name. It cost you 150.

USER: That's fine, thank you.

ASSISTANT: Thank you.