You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you?

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

ASSISTANT: Sure, I will help you with the flight ticket cancellation. May I know your name please?

USER: My previous reservation has done with my name Shirley Baker.

ASSISTANT: Ok, please wait for a moment. I will check with your details and get back to you.

USER: Sure.

ASSISTANT: Thanks for waiting. But I am sorry to say that there is no reservation on your name.

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

ASSISTANT: Ok, thanks for reaching to us.

USER: Thank you for providing information.