You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, do you need any help from us?

USER: Can you help me to change the flight reservation which I had did recently?

ASSISTANT: Sure, may I know your good name please?

USER: Ok, my reservation is done on the name Debra Roberts.

ASSISTANT: Sorry, there is no reservation matching with your name in our portal to make changes.

USER: Ok, please take the time you need. That is ok. Thank you for providing the information.

ASSISTANT: You are welcome, have a great day.