You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I be at your service today?

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

ASSISTANT: Sure, we will help you. Can I have your name to check your details?

USER: Sure, I am Susan Walker.

ASSISTANT: OK, please wait a moment.

USER: Ok.

ASSISTANT: I regret, there is no reservation found on your name to proceed further.

USER: Ok, Thank you for your help.

ASSISTANT: Thank you for reaching us.