You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Joshua Moore.

ASSISTANT: How can I help you?

USER: I have planned to meet my brother after a long time at Seattle in this weekend, so please help me with booking a connecting flight ticket.

ASSISTANT: Sure, I am happy to help you.

USER: Thank you.

ASSISTANT: Can you please let me know your airport codes?

USER: Sure, I will depart from IAD and reach SEA.

ASSISTANT: On which dates would you like to book a ticket?

USER: I am going on 08/02 and return back on 08/03.

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

USER: I regret, my return date is on 08/04. My budget is 1000.

ASSISTANT: Please wait a moment.

USER: Ok.

ASSISTANT: Thanks for waiting. Unfortunately there  are no flights available on that dates.

USER: Ok, no problem.

ASSISTANT: Thank you for reaching us.

USER: Thank you for your effort.

ASSISTANT: Have a good day.