You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER:  Owing to an emergency, I want to change my reservation. Can you please help me with that?

ASSISTANT: Sure, I am here to help you with that, can I know your good name to proceed further?

USER: Catherine Nelson here.

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

USER: Thank you.

ASSISTANT: Thank you for reaching us.