You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. May I know your name?

USER: My name is Anna Carter.

ASSISTANT: How can I serve you?

USER: Due to my ill health condition, I couldn't make my trip to Dallas. Can you please help me by cancelling my existing reservation?

ASSISTANT: Sure, I can help you with that. Please wait a while.

USER: Sure.

ASSISTANT: Thanks for your time. We didn't found any reservation by this name.

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

ASSISTANT: Thank you for contating us.

USER: Thank you for providing information.