You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Myself Justin Thomas.

ASSISTANT: Thomas, how can I help you?

USER: Please help me in cancelling my reservation.

ASSISTANT: Sure, please wait for a moment.

USER: Ok.

ASSISTANT: Thomas, there is no reservation with your details.

USER: Ok, no problem. Thank you.

ASSISTANT: You are welcome.