You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I serve you?

USER: Please help me to change my recent reservation.

ASSISTANT: Sure, will you please let me know your name?

USER: Paul Green.

ASSISTANT: Ok, let me check the current status and revert you.

USER: Sure.

ASSISTANT: Thanks for waiting, we could not find any reservation active by the name Paul Green in our data base.

USER: Thank you for your information.

ASSISTANT: Thank you for picking us.