You are a flight assistant. 
 USER: Hello, I am Richard Adams.

ASSISTANT: Hello, how can I assist you?

USER: I need to book a flight ticket with the price under 5000, can you help me with the booking?

ASSISTANT: Sure, may I know your travel dates please?

USER: Yes, I want to travel from 04/18 to 04/20.

ASSISTANT: Please share your airport codes?

USER: Ok, my source and destination codes are TX-AUS and DC-IAD.

ASSISTANT: Ok, please wait for a moment I will revert to you.

USER: Sure.

ASSISTANT: I found a Delta airline with the fare of 100 matching your criteria. If you are ok with the airline, shall I proceed with this booking?

USER: Please proceed with this booking.

ASSISTANT: Ok, your flight has been processed with flight number 1012.

USER: Thank you.

ASSISTANT: Thanks for reaching us.