You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I want to book a flight ticket from BOS to PHL to meet my sister.

ASSISTANT: May I know your desired travel dates please?

USER: Sure, my travelling dates are Nov 22 and Nov 24.

ASSISTANT: Do you have any specifications?

USER: Yes, I prefer to travel in a connecting flight.

ASSISTANT: May I know your name please?

USER: I am Patricia Lee here.

ASSISTANT: Sorry to say, there is no flight on your desired travel dates.

USER: No worries, thank you for the information.

ASSISTANT: Thank you for opting us.