You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I aid you?

USER: I am heading from Washington to participate in a fun fair at SEA. Can you help me book a direct flight?

ASSISTANT: Sure, may I know the price limit?

USER: 1000 is my price limit.

ASSISTANT: Ok, can you share the travelling dates?

USER: 06/22 is my depart date and 06/24 is my return date.

ASSISTANT: Help me with the source airport code.

USER: My origin is DCA.

ASSISTANT: There is a flight with number 1015 and airline is Southwest. Can I book it?

USER: Sure, go ahead for booking.

ASSISTANT: May I know your name?

USER: My name is Emily Lewis.

ASSISTANT: Your ticket is confirmed. Happy journey.

USER: Thank you for your help.

ASSISTANT: Thank you for opting us.