You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve 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, we are here to help you. May I know your name please?

USER: Mary Scott here.

ASSISTANT: Ok, please be on hold.

USER: Sure.

ASSISTANT: Sorry we did not find any reservation against your name in our database.

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

ASSISTANT: Thank you for choosing us.