You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you today?

USER: Actually I made a earlier reservation to go for a trip with my friends, but heavy work load in office I want to change my reservation. Can you please help me in that?

ASSISTANT: Sure, I'll try to help you in changing an existing reservation. I need some basic information to check your ticket details, can you please tell me your full name?

USER: Thank you for taking my request into consideration. My name is Dennis Wilson.

ASSISTANT: Ok, please wait a minute I will get back to you with the present status.

USER: Sure.

ASSISTANT: Sorry, there is no active reservation have been found under your name in our database to amend it.

USER: Ok, that's not a problem. Thank you.

ASSISTANT: Thank you for availing us.