You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: Due to my ill health, I would like to cancel my trip to Dallas. Can you please help me by cancelling my recent reservation?

ASSISTANT: Sure, may I know your name for finding your reservation?

USER: My previous reservation has done with my name Justin Miller.

ASSISTANT: No reservation found on your name.

USER: Ok, not an issue. May be something went wrong while booking the ticket. Thank you for providing information.

ASSISTANT: Thanks for using our service.