You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I aid you at this moment?

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

ASSISTANT: Sure, I am here to help you with this.

USER: Ok.

ASSISTANT: Can you please provide your name on which you have made the reservation previously?

USER: I am Michael Evans.

ASSISTANT: Wait a moment please.

USER: Sure.

ASSISTANT: Michael Evans, there is no active reservation found under your name in our database.

USER: Not a big deal, anyhow thank you very much for your service.

ASSISTANT: Thank you for choosing us.