You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how best I can do for you?

USER: I made a earlier reservation earlier to sign a new contract for new project, due to some problems it has been postponed. Can you please change my reservation?

ASSISTANT: Sure, I am here to help. May I know your good name?

USER: Sure, I am Sandra Moore.

ASSISTANT: Ok, please wait for a while.

USER: Sure, I will wait.

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

USER: Ok, Thank you for providing information.

ASSISTANT: Thank you choosing us.