You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I best aid you now?

USER: I want to change my existing reservation due to sudden change in my business meeting plan. Can you help me with that?

ASSISTANT: Sure, I am here to assist you.

USER: Thank you.

ASSISTANT: Please notify me your good name?

USER: Sure, I am Christopher Lewis.

ASSISTANT: Ok, Just give me a moment please.

USER: Sure.

ASSISTANT: Thanks for your time. Unfortunately, there is no active reservation found on your name.

USER: Ok, no issues. Thank you for your prompt service.

ASSISTANT: Thanks for approaching us, have a good day.