You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist 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 happy to help you with that.  Can I have your good name to check your reservation status?

USER: Emily Davis here.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: Sorry Emily Davis, no reservation has found under your name to change.

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

ASSISTANT: Thank you for choosing us.