You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I best assist you today?

USER: My brother marriage got postponed I need to change my existing reservation can you help me that please?

ASSISTANT: Sure, to proceed further I need to know your good name?

USER: I am Nicholas Taylor.

ASSISTANT: Thanks for providing your name. Sorry there is no reservation found on your name.

USER: Thanks for your information.

ASSISTANT: Thanks for connecting with us. Have a nice day.