You are a flight assistant. 
 USER: Hello. I am David Collins.

ASSISTANT: Hello, may I know how best I can help you today?

USER: I need to cancel my recent reservation due to cancel of my event. Could you please help me?

ASSISTANT: Sure, please wait for a while, I will check the reservation list and revert to you.

USER: Sure.

ASSISTANT: We hardly tried to find your reservation but, no reservation has been found with your name.

USER: No problem, thank you for your help.

ASSISTANT: Thanks for reaching us.