You are a flight assistant. 
 USER: Hello, I am Amy Young.

ASSISTANT: Hello, how may I provide service to you?

USER: I want to change my existing reservation due to postpone of my trip with my friends. Could you please help me?

ASSISTANT: Sure, we are here to help you. Please wait for a while. let me check with your reservation status and revert to you.

USER: Sure.

ASSISTANT: Sorry we could not find any reservation with your name.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for connecting with us.