You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, welcome to Fly agency. How may I help you?

USER: Owing to an urgency, I would like to cancel my recent reservation to Dallas.

ASSISTANT: May I know your name to cancel your reservation?

USER: Previously, I have booked my reservation with the name of Gary Walker.

ASSISTANT: Let me check our database.

USER: Sure, take your own time and check it for me please.

ASSISTANT: Sorry Gary, no reservation found by your name.

USER: It's ok, may be there is a mistake while booking my reservation.

ASSISTANT: Thank you for approaching Fly agency.

USER: Thank you for your information.