You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I want to change my reservation can you help in that?

ASSISTANT: Sure, may I know your name to check your ticket status in our website?

USER: I am Jessica Allen.

ASSISTANT: Allen, please hold on for a moment.

USER: Sure.

ASSISTANT: Sorry, no reservation found by your name.

USER: That,s ok.

ASSISTANT: Thank you for contacting us.

USER: Thank you for your help.