You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: I have done my flight ticket booking last week due to some reasons I want to cancel my reservation. Can you please help me out?

ASSISTANT: Sure I can help you, please tell me your name.

USER: I'm Gregory Jackson.

ASSISTANT: Gregory Jackson, there is no reservation found on your name.

USER: Ok, thank you for the information.

ASSISTANT: Thank you for contacting us.