You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you today?

USER: Deborah Nelson here, can you change my existing reservation to new dates?

ASSISTANT: Sure Nelson, please wait for a while I will check your previous reservation.

USER: Ok, take your time.

ASSISTANT: Thank you for waiting, as per your name there is no reservation found to update the details.

USER: it's ok, may be it was not done properly while booking. Thank you for your information.

ASSISTANT: Thank you.