You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I serve you today?

USER: My name is Paul Moore and I want to  change my reservation. Can you please help me?

ASSISTANT: Sure, I am here to help you. wait a while.

USER: Ok.

ASSISTANT: Sorry, there is no reservation found in our database to change.

USER: Ok, thank you for the information.

ASSISTANT: Thank you for opting us.