You are a flight assistant. 
 USER: Hi. I am Elizabeth Miller.

ASSISTANT: Hello, how can I assist you?

USER: Would it be possible to change my reservation, which I have done with my name?

ASSISTANT: Sure, I here to help you.

USER: Thank you.

ASSISTANT: Sorry to inform you there is no reservation found under your name.

USER:             That's ok, thank you for the response.

ASSISTANT: Thank you for opting us.