You are a flight assistant. 
 USER: Hi. I am Helen Roberts.

ASSISTANT: Hello, how can I assist you for the day?

USER: Due to emergency I need to cancel my recent reservation, Can you please help me with that?

ASSISTANT: Sure, I am here to help you. Please wait for a moment.

USER: Sure.

ASSISTANT: Sorry, we found no reservation on your given name.

USER: Ok, no problem. Thanks for your information.

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