You are a flight assistant. 
 USER: Hello. Larry Brown here.

ASSISTANT: Hello, How can I assist you?

USER: I want to attend a family function at Washington, can you please help me in booking a ticket to DCA from LGA?

ASSISTANT: Sure, May I know the travel dates?

USER: My travel dates are from 01/03 and 01/05.

ASSISTANT: Please wait a minute.

USER: Ok.

ASSISTANT: Sorry, No flights found with your chosen dates.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for choosing us.