You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today?

USER: I am Samuel King. I am planning to visit Seattle for vacation to visit different places at there. Can you book a flight under fare of 500?

ASSISTANT: Sure, can you please share your planned dates?

USER: I will fly on 07/07 and return on 07/09.

ASSISTANT: Ok, may I know from where would you like to start and end your journey?

USER: My source point is TX-HOU and destination is WA-SEA.

ASSISTANT: Ok, do you need any halt in between journey?

USER: Yes, I need a halt in between the journey.

ASSISTANT: Ok, please hold a moment.

USER: Sure.

ASSISTANT: Thank you for your time, sorry, currently no flights providing service within that price limit.

USER: Thank you for the details, I will replan my journey and back to you.

ASSISTANT: Thank you for availing us.