You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how best I can aid you today?

USER: I am Jacob Lopez. I made a reservation earlier in the wrong date unknowingly so, I want to change my existing reservation.

ASSISTANT: Sure, we are glad to help you to change it.

USER: Thank you.

ASSISTANT: Ok, please wait for a couple of minutes.

USER: Ok, I will wait.

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, Thank you.

ASSISTANT: Thank you for reaching us.