You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I be your assistance today?

USER: Owing to an urgency, I would like to cancel my recent reservation to Dallas. Can you please help me with this?

ASSISTANT: Sure, we are gleeful to help you out. May I know your name please?

USER: My previous reservation has done with my name Andrew Thompson.

ASSISTANT: Thanks for your name, please be on hold.

USER: Sure.

ASSISTANT: Thanks for being on hold, we did not find any reservation in our database on your name.

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

ASSISTANT: Thanks for availing us, we hope to serve you again.

USER: Thank you for providing information.