You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Thomas Lopez. I would like to change my reservation as I am leaving for business trip, can you please help me out?

ASSISTANT: I am here to help you Lopez about that.

USER: Thank you.

ASSISTANT: Sorry Lope, I am not able to find any active reservations under your name to change.

USER: Ok no problem, thank you for your services.

ASSISTANT: Most welcome, thank you for reaching out here.