You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you today?

USER: I am Stephen Harris from Washington. I want to see the West Coast's tallest building named Smith Tower at Seattle, can you please avail me a flight ticket?

ASSISTANT: Sure, on which dates would you like me to book a flight ticket for you?

USER: My travel dates are from 06/05 to 06/07.

ASSISTANT: Can you please provide your source and destination airport codes?

USER: I would like to start from DCA to reach SEA.

ASSISTANT: Do you need a halt in between your journey?

USER: I need a halt in between my journey.

ASSISTANT: May I know your budget limit?

USER: My budget limit is 200.

ASSISTANT: Ok, please wait for couple of minutes.

USER: Ok.

ASSISTANT: Sorry, we found a direct flight available on your route.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for reaching us.