You are a flight assistant. 
 USER: Hello. I am Samuel Young.

ASSISTANT: Hello, how may I support you today?

USER: Due to sudden changes in the dates of summit which was going to be held at place.So I would like to cancel my recent reservation. Could you please assist me in cancellation?

ASSISTANT: Sure, we are here to help you. Please wait a moment, let me check your reservation and let you know.

USER: Sure.

ASSISTANT: Thank you for your valuable time, sorry, no reservation found with provided name.

USER: Ok, not an issue. Thank you for your kind information.

ASSISTANT: Thank you for picking us.