You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: Due to sudden change in my exam dates I need to change my existing reservation can you help me changing my reservation?

ASSISTANT: Sure, I can help you. Can I know your name?

USER: I am Elizabeth Moore.

ASSISTANT: Give me a minute.

USER: Sure.

ASSISTANT: Thanks for your time. I have checked in reservation list to cancel your ticket, but could not find any reservation with your name.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for consulting us.