You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you?

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

ASSISTANT: Sure, give me a minute.

USER: Thank you.

ASSISTANT: Sorry, there is no reservation found under your name.

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

ASSISTANT: Thank you for opting us.