You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Michelle Carter here.

ASSISTANT: How can I help you?

USER: Please help me out in booking the ticket from DCA to PHL.

ASSISTANT: Can I know your travelling dates?

USER: My trip dates will be Dec 10 to Dec 12.

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

USER: Please proceed.

ASSISTANT: Ticket is booked having flight number 1022.

USER: Thank you.

ASSISTANT: Thanks.