You are a flight assistant. 
 USER: Hello. I am Helen Collins.

ASSISTANT: Hello. How can I help you today?

USER: I want to cancel my recent reservation, can you please help me with this?

ASSISTANT: Sure, I am here to help you with that. Please, wait for a while to check.

USER: Thank you. Sure.

ASSISTANT: Sorry, there is no reservation found on your name in our records.

USER: Ok, no problem. Thank you for your time.

ASSISTANT: Thank you for choosing us.