You are a flight assistant. 
 USER: Hi, Barbara Carter here.

ASSISTANT: Hello, how may I render you?

USER: I want to attend a live concert which is held at Chicago on 04/21 and return on 04/23, so can you please book me a flight ticket from Las Vegas?

ASSISTANT: Sure, please let me know if you need a lay by in between.

USER: Sure, I need a connection in between the journey.

ASSISTANT: Kindly share your airport codes.

USER: Ok, my airport codes are NV-LAS and IL-ORD.

ASSISTANT: Ok, there is an UA airline available on your required dates and the fare is 100.

USER: That's perfect, please go with booking.

ASSISTANT: Your booking has been done with flight number 1019.

USER: Thank you for the help.

ASSISTANT: Thank you for reaching us.