You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Is this flight ticket booking agency?

ASSISTANT: Yes, how may I assist you?

USER: I have to go Dallas from Las Vegas for attending my brother birthday party,  can you please check is there any flight available on 03/18?

ASSISTANT: Sure, please provide your airport codes.

USER: I want to departure from LAS airport because it is near to my location and destination airport code is DFW.

ASSISTANT: Ok, let me know your return date please.

USER: Please book my return ticket also on 03/20.

ASSISTANT: Can you provide your good name please?

USER: My name is Karen Thomas.

ASSISTANT: I found a flight for you in Delta airline with flight number 1021.

USER: Please book this flight ticket.

ASSISTANT: Ok, your ticket has been booked.

USER: Thank you for your help.

ASSISTANT: Thank you for approaching us.

USER: Welcome.