You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, How exactly I can serve you the best today?

USER: Can you help me to change an existing reservation due to my seminar got post pone?

ASSISTANT: Sure, I will help you with that.

USER: I am Jacob Phillips.

ASSISTANT: Please wait a while.

USER: Ok.

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, no issues. Thanks for your information.

ASSISTANT: Thank you for reaching us.