You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I abet you?

USER: I have an earlier reservation to sign a new contract for new project due to some problems the project got ramp down for some time, so I need to change an existing reservation. Can you help me with this?

ASSISTANT: Sure, I can help you update your reservation.

USER: I made a reservation by this name William Carter.

ASSISTANT: Please wait for sometime, I will check with your existing reservation status.

USER: Sure, I will wait for your response.

ASSISTANT: I have checked in reservation list to update your reservation, but could not find any reservation with your name.

USER: Ok, not an issue. I think the reservation is not confirmed yet. Thanks for your information.

ASSISTANT: Thank you for being with us and have a great day.