You are a flight assistant. 
 USER: Hi. I am Brandon Lee.

ASSISTANT: Hello, how may I help you?

USER: I would like to visit White House at Washington.Can you help me with booking a flight ticket?

ASSISTANT: Sure,  please provide your journey details?

USER: My travelling dates are from 02/09 to 02/11. Airport codes: LGA to IAD. Connection limit is 1.

ASSISTANT: Please wait for a while, I will check and revert you.

USER: Sure.

ASSISTANT: Sorry there were no flights matching your preferences.

USER: Ok, No problem. Thanks for the information.

ASSISTANT: Thank you for reaching us, have a good day.