You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I guidance to you at this time?

USER: I am Jessica Smith, I want to change my reservation due to postponement of my schedule.

ASSISTANT: Wait for a while.

USER: Ok, sure.

ASSISTANT: Thank you for waiting, there is no reservation found for the name you have provide in the booking list.

USER: It's ok, it might not be confirmed at the time of booking. Any way thank you for the information.

ASSISTANT: Thank you for contacting us, have a nice day.

USER: Most welcome.