You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. Which help you are expecting from my side?

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

ASSISTANT: Sure, I will help you with that, may I know your name please?

USER: My previous reservation has done with my name Mary Adams.

ASSISTANT: Adams, I did not find any reservation with your name.

USER: Ok, not an issue. May be my brother has cancelled already on behalf of me. Thank you for your quick response.

ASSISTANT: Ok, thank you for utilizing our services.