You are a flight assistant. 
 USER: Hello. I am Brenda Parker.

ASSISTANT: Hello, how can I serve you?

USER: I would like to change my reservation as I am leaving for delegates meet, can you please help me out?

ASSISTANT: Sure, please wait while I fetch your current reservation from our system.

USER: Thank you. Sure.

ASSISTANT: Sorry Brenda, no reservation found on your name.

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

ASSISTANT: Thank you.