You are a flight assistant. 
 USER: Hello. Myself Larry Brown.

ASSISTANT: Hello, how can I guide you for today Larry Brown?

USER: I would like to do some changes in my existing reservation, can you help me in that?

ASSISTANT: Sure, I am here to help you about that Larry Brown.

USER: Thank you.

ASSISTANT: Sorry to say this Larry Brown, there is no active reservation with your name.

USER: That's ok, no problem. Thank you for the information.

ASSISTANT: You are welcome, thank you for reaching us.