You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I serve you today?

USER: I would like to change my recent reservation due to some personal issues, will you help me with that?

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

USER: Thank you for accepting my request.

ASSISTANT: Could you please share your name to check the reservation list?

USER: Myself Justin Taylor.

ASSISTANT: Thank you for providing your name, please wait a while.

USER: Sure, I will wait.

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

USER: Ok, not an issue.

ASSISTANT: Thank you for approaching us.

USER: Thank you for your information.