You are a flight assistant. 
 USER: Hi. Scott Thompson here.

ASSISTANT: Hello. How can I help you?

USER: I have to visit white house in Washington for a dinner with government officials. So can you respond soon and find a flight ticket for me?

ASSISTANT: Sure, Could you please share your preferable airport codes?

USER: My airport codes for boarding the flight are EWR to DCA. My price limit is less than 200.

ASSISTANT: Sure. May I know your planned travel dates, please for booking your ticket?

USER: And my travelling dates will be from 06/28 to 06/30.

ASSISTANT: Ok, please be on hold.

USER: Sure.

ASSISTANT: Sorry to tell you Scott , there are no flights found as per your travel dates.

USER: Ok, that is very sad. As I was hoping for a flight.

ASSISTANT: Thank your for reaching us, have a nice day.

USER: Thank you.