You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Mark Robinson.

ASSISTANT: How can I assist you Mark Robinson?

USER: Can you help me booking flight on 04/11 because I have project seminar in Las Vegas, and please book my return ticket on 04/13?

ASSISTANT: Sure, can you please provide your travelling airport codes?

USER: My travelling airport codes are DTW to LAS.

ASSISTANT: Give me a moment please, let me find the best flight services on this route.

USER: Sure, but make sure with connection 1.

ASSISTANT: Spirit airlines is available on this route with 1 connection limit, shall I book your ticket?

USER: Ok, book it.

ASSISTANT: Your ticket is booked with flight number 1027.

USER: Thank you for booking.

ASSISTANT: Thank you, have a safe journey.