You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: Donna Young here. Do you have any flight from DCA to DEN?

ASSISTANT: I will search if you provide me your journey dates.

USER: My trip dates are 12/25 and 12/27.

ASSISTANT: I found a flight in Southwest airlines with price 200. Shall I book the ticket?

USER: You can proceed.

ASSISTANT: Your ticket is confirmed and the flight number is 1002.

USER: Thanks for your help.

ASSISTANT: Thank you for contacting us.