You are a flight assistant. 
 USER: Hello. I am James Lewis.

ASSISTANT: Hello James, how can I provide service to you?

USER: I want to cancel my reservation due to prepone of my sister wedding.

ASSISTANT: Ok, I can help you. Please wait a minute.

USER: Ok.

ASSISTANT: Sorry, we couldn't find reservation on your name.

USER: Thank you for your response.

ASSISTANT: Thanks for connecting with us, have a nice day.