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 recent reservation to Dallas. Can you help me with this?

ASSISTANT: Ok, may I know your name please to check our records?

USER: My previous reservation has done with the name Katherine Johnson.

ASSISTANT: Johnson, please wait for a minute.

USER: Sure, take your own time.

ASSISTANT: Johnson, there are no active reservations found with your details.

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

ASSISTANT: Sometimes it happens like that Johnson.

USER: Thank you for providing information.

ASSISTANT: Thank you for contacting us.