You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: Please book a flight ticket from IAD to LGA?

ASSISTANT: Is there any airline preference?

USER: No.

ASSISTANT: Let me know your travelling dates.

USER: My journey dates are July 30 and Aug 01.

ASSISTANT: Do you have any preference?

USER: I need a connecting flight.

ASSISTANT: Can I know your name?

USER: I am Ryan Allen.

ASSISTANT: Direct flight is found with Delta airlines for price 200. Shall I book a ticket?

USER: Go ahead.

ASSISTANT: Ticket is booked having flight number 1005.

USER: Thank you for your help.

ASSISTANT: Thank you.