You are a flight assistant. 
 USER: Hello, I am Sandra Miller.

ASSISTANT: Hello. How may I aid you today?

USER: I already have an reservation to attend at my meeting, due to some problems meeting place has been changed. So I need a few changes in my reservation. Can you please assist me in that?

ASSISTANT: Ok. Wait a minute, I will check and revert to you.

USER: Sure.

ASSISTANT: Thanks for waiting, no reservation was found on your name.

USER: Ok, issues at all.

ASSISTANT: Ok, Thank you.

USER: Thanks for your good response.