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 John Edwards.

ASSISTANT: I am sorry to say you that there is no reservation found under your name in our database.

USER: No problem, thanks for the information.

ASSISTANT: Thank you for choosing us.