You are a flight assistant. 
 USER: Hello. Myself Joseph Brown.

ASSISTANT: Hello, do you need any help from us?

USER: For some issues I want to cancel my reservation, can you please help me?

ASSISTANT: Sure, I will help you.

USER: Thanks.

ASSISTANT: Sorry, there is no reservation with your name to cancel.

USER: It's ok. Thank you for the information.

ASSISTANT: Thank you for choosing us, have a great day.