You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I guide you?

USER: Sandra Martin here. I want to travel from DC-IAD for a round trip. Can you please help me for booking the flight ticket?

ASSISTANT: Sure, could you help me with your requirements for this trip?

USER: My departure date is 07/07 and return date is 07/09.

ASSISTANT: Please wait for a moment to check the availability.

USER: Ok, I will wait.

ASSISTANT: There is a flight-1009 of JetBlue airlines, shall I proceed?

USER: If the price limit is 500, then proceed for booking the ticket.

ASSISTANT: Ok, your booking is done.

USER: Thank you for helping me.

ASSISTANT: Welcome.