You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER:  I am Gary Lee want to surprise my mother on her birthday at MA-BOS. Can you book a ticket from CA-SFO?

ASSISTANT: Sure, can you please share your trip dates?

USER:  My trip dates are 04/19 and 04/21.

ASSISTANT: Do you have any specifications?

USER:  I need a connecting flight.

ASSISTANT: Please wait for a while.

USER: Ok.

ASSISTANT: Sorry, there is no connecting flight with your given dates.

USER:  Ok,  no  issues thank you for your help.

ASSISTANT: Thanks for choosing us.