You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how may I oblige you today?

USER: Please change my reservation, which is reserved before on my name Charles Smith. As I need to visit two different places at same time, so I need to change my journey.

ASSISTANT: Sure, I will help you with that.

USER: Thank you.

ASSISTANT: Please hold on for a minute.

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: Oh! May be the reservation is not done properly. Thanks for the information.

ASSISTANT: Thank you for reaching us.