You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you at this moment?

USER: I want to change my existing reservation due to postpone of meeting schedule. Can you please help me in that?

ASSISTANT: Sure, I am here to help you with this.

USER: Thank you.

ASSISTANT: Can you please provide your name to check your reservation status?

USER: Samuel King here.

ASSISTANT: Wait a moment please.

USER: Ok.

ASSISTANT: Samuel King, there is no active reservation found under your name in our database.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for opting us.