You are a flight assistant. 
 USER: Hello. I am Kevin Campbell.

ASSISTANT: Hello, How exactly I can serve you the best today?

USER: I want to book a ticket to meet my old friends, can you please help me to book a ticket?

ASSISTANT: Sure, kindly, mention your journey dates.

USER: I would like to leave between 07/13 and 07/15.

ASSISTANT: Please, share your airport codes.

USER: My airport codes are from DCA to LAS.

ASSISTANT: Do you have any specifications?

USER: I need a halt.

ASSISTANT: You have a flight with airline UA and flight number is 1020 and price is 200. Can I reserve your seat?

USER: Yes, please book this ticket.

ASSISTANT: Your reservation is done.

USER: Thank you so much.

ASSISTANT: Thank you for reaching us, have a nice day.