You are a flight assistant. 
 USER: Hello, I am Elizabeth Evans.

ASSISTANT: Hello, how may I aid you?

USER: I want to book a flight ticket under price 500 only. Can you help me in finding?

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

USER: Yes, My origin is DC - IAD and destination is NC - CLT.

ASSISTANT: Please mention your journey dates?

USER: I would start on 03/24 and return on 03/26.

ASSISTANT: Please wait a while.

USER: Sure.

ASSISTANT: Thanks for waiting. We found a flight with Spirit airline and flight number is 1007 having single connection. Shall i proceed booking?

USER: Yes please.

ASSISTANT: Your ticket has been booked.

USER: Thanks for your service.

ASSISTANT: Thank you for reaching us. Have a safe journey.