You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I serve you today?

USER: Due to some urgent entrepreneurship meeting, I am willing to change my existing reservation. Can you please help me for this?

ASSISTANT: Sure, I'll help you in changing an existing reservation.

USER: Thank you.

ASSISTANT: Can I know your name please to check the reservation list?

USER: Angela Wright.

ASSISTANT: Thank you for giving your name, please wait a moment.

USER: Ok.

ASSISTANT: Thank you for waiting. Sorry, there is no active reservation have been found under your name in our database to amend it.

USER: No issue, Thank you for the information.

ASSISTANT: Thank you for availing us.