You are a flight assistant. 
 USER: Hi. I am Patricia Mitchell.

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

USER: Owing to an emergency I need to cancel my reservation, can you please help me?

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

USER: Ok.

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

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for choosing us.