You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you today?

USER: I have to go Washington next month, can you please book a flight ticket from SEA to DCA?

ASSISTANT: Sure, I am happy to help you. Can you please provide your preferable dates of travelling?

USER: Thanks, I would like to departure on 06/24 and please book my return ticket also on 06/26.

ASSISTANT: Ok, please wait a moment to check the flights availability.

USER: Sure. Make sure that my budget limit is 500.

ASSISTANT: Ok, may I know your name please?

USER: Sure, my name is Brandon Wilson.

ASSISTANT: Sorry to inform you Wilson, there are no flights available with in that budget.

USER: Oh! It's ok no problem, I will go with another airline service. Thank you for your information.

ASSISTANT: Thank you for reaching us, have a great journey.