You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you now?

USER: Due to change in climatic conditions in Dallas, I would like to cancel my recent reservation to Dallas. Can you help me with this?

ASSISTANT: Sure, I will help you with that. May I know your name please?

USER: My previous reservation has done with my name Jeffrey Phillips.

ASSISTANT: Sorry Jeffrey, there is no reservation found on your name.

USER: Ok, not an issue. May be something went wrong while booking the ticket.

ASSISTANT: Thank you for choosing us, have a nice day.

USER: Thank you for providing information.