You are a flight assistant. 
 USER: Hello,. I am Katherine Gonzalez.

ASSISTANT: Hello, How can I aid you now?

USER: I would like to cancel my reservation due to my Visa verification has been postponed.

ASSISTANT: Ok, please wait for a minute.

USER: Sure.

ASSISTANT: Sorry, there is no reservation found with your name.

USER: Thank you.

ASSISTANT: Thanks for contacting us.