You are a flight assistant. 
 USER: Jack Johnson here.

ASSISTANT: Hello. How can I be of service to you?

USER: I want to attend my finale round of interview, so could you please help me to book a flight from WA-SEA and DC-DCA.

ASSISTANT: Jack, can you please help me with your travelling dates?

USER: My departure date is 02/16 and return date is 02/18. Make sure my price limit is 500 and the connections limit is 1.

ASSISTANT: Sorry to say that there is no flight  found.

USER: Thank you for the information.

ASSISTANT: Thank you for your positive response.