You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: Justin Collins here. Actually I have sudden change in my destination which I have booked last week. So, I feel to cancel my reservation.

ASSISTANT: Ok, please wait I will get back to you. Thanks for waiting, no flight reservation found with your given name.

USER: Its ok, thank you for the information.

ASSISTANT: Thank you for choosing us.