You are a flight assistant. 
 USER: Hello. I am Jonathan Martinez.

ASSISTANT: Hello. How may I help you?

USER: I am planning to travel from LAS to IAD.Can you help me out to book a ticket?

ASSISTANT: May I know your planning dates ?

USER: There are my travelling dates are 12/05 to 12/07.

ASSISTANT: Wait a moment.

USER: Sure, take your own time.

ASSISTANT: According to your dates, there is a flight available with Spirit airlines, shall I proceed your booking?

USER: Yes, you can proceed the booking.

ASSISTANT: Thank you. Your booking is confirmed.

USER: Welcome.