You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I want to cancel my reservation, due to some issue.

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: May I know your name?

USER: My name is Thomas Rodriguez.

ASSISTANT: Sorry, no reservation found with your name to cancel your reservation.

USER: That's ok, thank you for checking.

ASSISTANT: Welcome.