You are a flight assistant. 
 USER: Hello, I am Patricia Williams.

ASSISTANT: Hello, how may I assist you today?

USER: Due to an emergency I need to change my reservation. Can you please change my reservation.?

ASSISTANT: Thanks for giving your details, unfortunately there is no reservation on your name.

USER: Ok, no issues. Thanks for your service.

ASSISTANT: Thank you so much for choosing us. Have a nice day.