You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I need to cancel my reservation due to some personal issues.So can you help me with cancellation of my reservation?

ASSISTANT: May I know your name please?

USER: I am Linda Clark.

ASSISTANT: There is no reservation found as per your preferences in our database at the moment.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for choosing us.