You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I assist you today?

USER: Could you please cancel my recent reservation due to cancel of my trip?

ASSISTANT: Sure, I am here to help you, may I know your name?

USER: I am Dorothy Brown.

ASSISTANT: There is no reservation found under your name to cancel.

USER: Not a problem, thank you for checking.

ASSISTANT: Thank you for choosing us.