You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: Please help me to cancel my recent reservation due to personal problems.

ASSISTANT: May I know your name to proceed further?

USER: Mary Wilson here.

ASSISTANT: Thank you for the information, please wait for a while.

USER: Sure, take your own time.

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

USER: That's ok, thank you for checking.

ASSISTANT: Thank you for choosing us.