You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How could I assist you at this moment?

USER: My name is Donald Allen, I want to cancel my recent reservation due to cancel of my conference.

ASSISTANT: Sure, please wait for some time.

USER: Ok.

ASSISTANT: There is no recent reservation found on your name.

USER: No problem, thanks for your help.

ASSISTANT: Thank you for contacting us.