You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I guide you?

USER: I want to book a flight on April 22nd to travel to DCA, can you please help?

ASSISTANT: Sure, I can help you.

USER: Thank you.

ASSISTANT: When would you like to return?

USER: I will be heading back on April 24th.

ASSISTANT: Where would you like to start from?

USER: I will board form OAK.

ASSISTANT: May I know your name?

USER: My name is Mary Hill.

ASSISTANT: Is there any other requirements?

USER: I prefer to travel in economy class.

ASSISTANT: Ok. We found a direct flight with an economy class. Can I reserve it?

USER: Please reserve it.

ASSISTANT: Your flight ticket has been reserved with an Hawaiian airlines, flight number:1013.

USER: Thank you for your help in the booking.

ASSISTANT: Thank you for picking us.