You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: Due to sudden change in the dates of summit which was going to be held in the place,so I want to cancel my recent reservation, can you please help me?

ASSISTANT: Sure, I am here to help you. May I know your name?

USER: I am Benjamin Anderson.

ASSISTANT: Ok Anderson, there is no reservation found for you.

USER: Ok, thanks for your information.

ASSISTANT: You are welcome, have a nice day.

USER: Thank you.