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

ASSISTANT: Hello, how may I render you?

USER: I am not feeling well to travel so, please cancel my flight ticket?

ASSISTANT: Sure, let me check the data base and revert you.

USER: OK.

ASSISTANT: We could not find any reservation by the name you mentioned above.

USER: Ok, no problem. Thanks for the information.

ASSISTANT: Thank you for opting us.