You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you?

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 that, can I know your good name to proceed further?

USER: Sarah Carter here.

ASSISTANT: Thank you. Please be online for a while. I will check your reservation status and get back to you.

USER: Sure.

ASSISTANT: I am sorry to say you that there is no reservation found under your name in our database.

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

ASSISTANT: Thanks for reaching us.