You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, what can I do for you today?

USER: Myself Kenneth Allen from Detroit. I made a reservation earlier to sign a contract for new project, due to some problems it has been postponed.Can you please help me to change an existing reservation?

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: Please wait for a couple of minutes to check the reservation list.

USER: Sure.

ASSISTANT: Thank you for waiting, we are sorry to say that no reservation was found on your name.

USER: Ok, That's not a problem.

ASSISTANT: Thank you for availing our services.

USER: Thanks for your information.