You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, please let me know do you need any assistance?

USER: Owing to an emergency, my plans to visit Dallas has cancelled. Could you cancel my recent reservation please?

ASSISTANT: Sure, please wait it may take few minutes. Can you please provide your name?

USER: My name is William Moore.

ASSISTANT: Moore, your reservation is found.

USER: Thank you for your help in cancelling the ticket.

ASSISTANT: I cancelled your flight ticket and the airline is not charging you their normal fee.

USER: That's fine.

ASSISTANT: Thank you for choosing us.

USER: Welcome.