You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how may I help you?

USER: I am Alexander Hall. I want to book a flight ticket to meet my uncle in Las Vegas, will you help me in booking a flight ticket with a price limit of 5000?

ASSISTANT: Sure, can I know your travelling dates?

USER: I want to travel on 05/04, and need to catch return flight on 05/06.

ASSISTANT: Ok, let me know your source and destination airport codes?

USER:  I need to leave from my nearest airport DCA to reach LAS.

ASSISTANT: We found a flight from JetBlue airline with 1 connection and fare is 300 with an economy class. Shall I proceed?

USER: Yes, Proceed with the booking.

ASSISTANT: Your ticket is booked with 1010 flight number.

USER: Thanks for the kind service.

ASSISTANT: Thank you for reaching us.