You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how can I assist you today?

USER: I am Joseph Green, we friends have a plan to visit Canada, but one of our friend is ill. So we are canceling our plan. Please help us to cancel the ticket.

ASSISTANT: Sure, we are here to help to you to cancel your reservation. Can you please assign your name?

USER: Joseph Green.

ASSISTANT: OK, please wait for a moment.

USER: OK.

ASSISTANT: I will check and inform you. Sorry for inconvenience, there is no reservation found based on your name.

USER: Thank you for the information.

ASSISTANT: Thanks for reaching us.