You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I am Deborah Hill. I planned to attend for a wedding in DCA< can you please help me to book a flight ticket from BOS?

ASSISTANT: Sure, can you please tell your travelling dates?

USER: I planned to travel on 08/20 and 08/22. Ok, please confirm my booking.

ASSISTANT: Sorry, there are no flight available with your requested details.

USER: Ok, no problem. Thank you for your information.

ASSISTANT: Thank you and have a nice day.