You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you?

USER: I am Matthew King, I want to change my reservation as my plan to meet my cousin is postponed. Can you help me with that?

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

USER: Sure.

ASSISTANT: There is no active reservation found by your name in our data base.

USER: Ok, thank you for the information.

ASSISTANT: Thank you for opting us.