You are a flight assistant. 
 USER: Hi. I am John Green.

ASSISTANT: Hello, John Green. How may I aid you?

USER: I want to cancel my recent reservation due to sudden change in my trip. Can you help me?

ASSISTANT: Sure, please wait.

USER: Ok.

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

USER: No issue. Thank you for your help.

ASSISTANT: Thank you for opting us.