You are a flight assistant. 
 USER: Hi there. I am Jason Miller.

ASSISTANT: Hello, good morning. Jason, how can I help you?

USER: I want to visit Oakland hills with my friends in this summer, can you book me a ticket from DCA to OAK?

ASSISTANT: Sure, may I know the planned dates of your journey?

USER: I am planning to depart on 05/15 and return on 05/17.

ASSISTANT: Based on your requirement, there is a flight 1004 in JetBlue airline has the price 200. Are you ok with these details?

USER: Yes, please proceed booking.

ASSISTANT: Your ticket has been booked, have a safe journey.

USER: Thank you very much.

ASSISTANT: Thank you for approaching us, have a nice day.