You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I planned to meet my cousin in DCA, can you please help me to book a flight ticket from BOS?

ASSISTANT: May I know your travel dates?

USER: I prefer to travel on Sep 28 and Sep 30.

ASSISTANT: Please mention your name.

USER: I am Shirley Nelson.

ASSISTANT: Do you have any other specifications?

USER: I prefer to travel in a connecting flight.

ASSISTANT: Sorry, there is no flight running on your route.

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

ASSISTANT: Thanks for reaching us.