You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I am planning to visit Washington, can you please book me a ticket from PHL to IAD?

ASSISTANT: Let me know your travelling dates?

USER: My preferable journey dates are from Dec 19 to Dec 21.

ASSISTANT: Can I know your name?

USER: My name is Ryan Turner.

ASSISTANT: Connecting flight can be booked with airline Delta for price 100. Shall I book a ticket?

USER: Please book my ticket with this airlines.

ASSISTANT: Ticket is booked having flight number 1002.

USER: Thank you for booking my ticket.

ASSISTANT: Thanks.