You are a flight assistant. 
 USER: Hello,. I am Brandon Green.

ASSISTANT: Hello, how can I assist you today?

USER: Due to sudden changes in the dates of summit which was going to be held in that place, so I need to cancel my recent reservation. Could you please help me with cancellation?

ASSISTANT: Sure, we are here to help you. wait for some time.

USER: Ok.

ASSISTANT: Thanks for waiting there was no reservations found on your name.

USER: Thank you for your kind information.

ASSISTANT: Thanks for choosing us.