You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello. How can I aid you at this minute?

USER: I would like to travel  in economy class, can you please make a airline reservation for me?

ASSISTANT: Sure, I am happy to help you with that. Can I know your travelling dates?

USER: My journey start from Oakland on May 12th, and I intend to return back on May 14th.

ASSISTANT: Ok, may I know your exact airport codes?

USER: My origin airport code is OAK, and destination airport code is BOS.

ASSISTANT: Do you have any other requirements?

USER: I need a break in my journey. I always prefer normal-cost airlines. And my return time flight time is in the afternoon.

ASSISTANT: Sorry to say that, there are no flight's available based on your journey details.

USER: Ok, no problem.

ASSISTANT: May I know your name for the documentation purpose?

USER: Sure, this is Ryan Miller.

ASSISTANT: Thank you for reaching us.

USER: Thank you for your information.