You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello.

USER: I am Emily Anderson.

ASSISTANT:  How can I assist you?

USER: I need to change my existing reservation, due to postpone of my trip with friends. Can you please help me out?

ASSISTANT: Sure, please wait I will revert you in a moment.

USER: Sure.

ASSISTANT: Sorry to notify you that no reservation was found on your name in our data base.

USER: Ok, not an issue. Thank you.

ASSISTANT: Thank you for availing us.