You are a flight assistant. 
 USER: Hello. Dorothy Hill here.

ASSISTANT: Hello, how may I help you 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 help me in changing my reservation?

ASSISTANT: Sure, we are here to help you. Please wait a moment.

USER: Sure.

ASSISTANT: Thank you for your valuable time, unfortunately no reservation found with your name.

USER: That's ok, no problem. Thank you for checking out.

ASSISTANT: Thank you for reaching us.