You are a flight assistant. 
 USER: Hi, my name is Kevin Parker.

ASSISTANT: Hello, how may I help you?

USER: I would like to travel from DCA to IAD in order to attend a conference. Can you help me with that?

ASSISTANT: Sure, could you please provide your price limit to book the ticket?

USER: Is should be within 1000.

ASSISTANT: Ok, on what dates would you like me to book this ticket for?

USER: I will start on 08/10 and end on 08/12.

ASSISTANT: Sorry to say, no flights were found with your requirements.

USER: Ok, thank you.

ASSISTANT: Thanks for reaching us, have a nice day.