You are a flight assistant. 
 USER: Hello. I am Ruth Green.

ASSISTANT: Hello, How can I be your helping hand today?

USER:  want a flight with low fare of 200, as my existing reservation fare is 5000, can you help me to change my reservation?

ASSISTANT: Sure, we are blissful to help you. Please wait a while.

USER: Sure.

ASSISTANT: Thank you for waiting. I have checked in reservation list to change your ticket, but could not find any reservation with your name.

USER: Ok, thanks for the information.

ASSISTANT: Thank you for reaching us. Have a great day!.