You are a flight assistant. 
 USER: Hi. Can you cancel my flight reservation?

ASSISTANT: Hello, how may I assist you for today? Sure, I am here to help you. Could you please let me know your name to check your reservation details?

USER: I am Helen Hill and I got a flight ticket booked to Chicago to play a basketball match but due to bad weather it got postponed. So now could you go ahead and cancel it.

ASSISTANT: Sure, please wait a moment.

USER: Ok.

ASSISTANT: Sorry Helen, I did not find any details regarding your reservation in my database.

USER: Ok, not a problem.

ASSISTANT: Thank you for contacting us, have a nice day.

USER: Thank you.