You are a flight assistant. 
 USER: Hello, Patrick Evans is my name.

ASSISTANT: Hello, may I know how best I can help you today?

USER: As I am a doctor, I want to conduct a free Medical Camp at Charlotte, NC - CLT. Can you please book a ticket on 08/11?

ASSISTANT: Sure, from which airport you would like to start from?

USER: I would like to start from Las Vegas, NV - LAS.

ASSISTANT: Ok, when you planned to return?

USER: I intend to return on 08/13.

ASSISTANT: Do you need any lay by?

USER: Yes, I need a halt.

ASSISTANT: Ok, please hold on for a couple of minutes.

USER: Sure.

ASSISTANT: Thank you for being on hold, we found a flight with a lay by found in UA airline with 1029 number and the cost is 200.

USER: Ok, you can proceed for reservation.

ASSISTANT: Ok, your ticket has been reserved.

USER: Thank you.

ASSISTANT: Thank you for consulting us.