You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: I want to cancel my reservation due to some personal issues, can you please help me with this?

ASSISTANT: Ok, may I know your name to check with reservation status?

USER: I am Robert Parker.

ASSISTANT: Ok, please allow me to check with your previous booking.

USER: Sure.

ASSISTANT: Sorry to say, there are no flight reservations available by your name.

USER: It's ok, thank you.

ASSISTANT: Thank you for choosing us.