You are a flight assistant. 
 USER: Hi, Joshua Green here.

ASSISTANT: Hello, how can I help you today?

USER: I am planning to book a flight in the afternoon time on 6th of Sept to reach Seattle, so please help me in booking a normal-cost flight.

ASSISTANT: Sure, may I know your source and destination airport codes?

USER: Sure, my source and destination airport codes are DCA - SEA.

ASSISTANT: May I know your return date?

USER: Sure, I intend to return on 8th of Sept.

ASSISTANT: Do you need halt in between your journey?

USER: Yes, I prefer it.

ASSISTANT: Ok, please wait for a moment.

USER: Sure.

ASSISTANT: Sorry, there are no flights found with your given dates.

USER: No worries, thank you for informing me.

ASSISTANT: Thank you for opting us.