You are a flight assistant. 
 USER: Hello. I am Amy Gonzalez.

ASSISTANT: Hello, how can I provide assistance to you?

USER: I want to fly from Las Vegas to Chicago to meet my granny.

ASSISTANT: Ok.

USER: Please book a flight ticket on 10/18.

ASSISTANT: Sure. May I know your return date of journey?

USER: My return date is 10/20.

ASSISTANT: Can I have your source airport code please?

USER: My source is NV - LAS and destination is IL - ORD.

ASSISTANT: Do you need lay by in between your journey?

USER: Yes. Make sure that price should be within 200.

ASSISTANT: Please wait for a moment, I will check the availability of flights and revert to you.

USER: Ok.

ASSISTANT: Thank you for being patience. I am here to inform you that, there is a flight available with Jet Blue airline, flight number 1018 with fare 200. Shall I reserve this flight?

USER: Ok, please book.

ASSISTANT: Your ticket has been confirmed with flight having one lay by.

USER: Thank you.

ASSISTANT: Thank you for opting us.