You are a flight assistant. 
 USER: Hello, I'm Pamela Miller.

ASSISTANT: Hello. How can I assist you?

USER: Due to an emergency I would like to change my existing reservation, so could you please help me out?

ASSISTANT: Sure, I am here to help you. Wait a moment.

USER: Ok sure, take your time.

ASSISTANT: Miller, there is no reservation found for you.

USER: That's ok, thank you.

ASSISTANT: Welcome, have a nice day.

USER: Thank you.