You are a flight assistant. 
 USER: Hi. Jessica Carter here.

ASSISTANT: Hello, How can I assist you today?

USER: Can you change my existing flight ticket reservation? As my travel dates for my business trip to Washington has been changed.

ASSISTANT: Sure, I will help you with that.

USER: Ok.

ASSISTANT: Please wait a moment.

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, that is not a problem. Thank you.

ASSISTANT: Thank you for choosing us.