You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how can I serve you?

USER: My name is Patricia Thomas. I want to attend my sister marriage, so please help me for booking a flight ticket.

ASSISTANT: Sure.

USER: My source and destinations are DC-IAD, MI-DTW.

ASSISTANT: Can you please provide the journey details?

USER: And my journey dates are 12/21, 12/23.

ASSISTANT: Thanks for your information. Please wait for a moment,I will check the availabilty and revert you.

USER: OK sure.

ASSISTANT: We found a flight matching to your details. The flight details are as follows, flight number: 1002,airline: Spirit,price: 200. Shall I proceed for booking?

USER: Yes please.

ASSISTANT: Your booking has been confirmed.

USER: OK, thank you for your service.

ASSISTANT: Thanks for choosing us.