You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. May I know your good name, Please?

USER: My name is Margaret Campbell.

ASSISTANT: How may I help you for the day?

USER: I have a plan with my friends to visit Museum of Science, help us to find a flight.

ASSISTANT: Sure. May I know your airport codes, Please?

USER: I need a flight to Boston, MA-BOS and from Washington DC-DCA.

ASSISTANT: OK. May I know your travel dates, Please?

USER: Our plan is to fly on 06/07 and return after two days on 06/09.

ASSISTANT: Thank you, For providing the information. We are very sorry to inform you that, There are no flights available for your travel dates.

USER: Ok, thanks for the information.

ASSISTANT: Thank you, For making an inquiry to book a ticket with us. Have a great day.