You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you today?

USER: I want to change my reservation due to meeting delayed a week. Can you help me in this?

ASSISTANT: Sure, I will help you with that.

USER: Thank you.

ASSISTANT: May I know on what name your ticket is reserved?

USER: I have reserved on the name of Donna Thompson.

ASSISTANT: Ok, please wait for a minute.

USER: OK.

ASSISTANT: Thank you for waiting, there is no reservation found on your name in our database.

USER: Ok, no issues with that. Thanks for the information.

ASSISTANT: Thank you for opting us.