You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you today?

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

ASSISTANT: Let me know your name to check your reservation?

USER: I am Dorothy Smith.

ASSISTANT: Sorry, there is no active reservation on your name in our records.

USER:  No problem, thank you for the information.

ASSISTANT: Thank you for choosing us.