You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I best assist you now?

USER: I want to change my reservation as my plan to meet my friend is postponed. Can you help me with that?

ASSISTANT: Sure, I can change your reservation right now. Before that I need to know your good name please?

USER: My name is Amy Mitchell.

ASSISTANT: Ok, Please allow me a moment to check for the previous reservation in our database.

USER: Sure.

ASSISTANT: Thanks for your time, we are sorry to say that there is no active reservation found on your name.

USER: Thank you for the information.

ASSISTANT: Thanks for opting us, wish you a great day.