You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is Barbara Hall.

ASSISTANT: In which way I can aid you at this moment?

USER: I am planning to book a flight ticket to BOS from SFO, could you please help me out?

ASSISTANT: Sure, I am happy to aid you in booking flight ticket. Could you please mention your preferable travel dates?

USER: Sure, my planned travelling dates are 11/19 and 11/21.

ASSISTANT: Ok, please wait a moment, I will check flight availability in this route.

USER: Ok, take your time.

ASSISTANT: Sorry for the inconvenience no flights available in this route as per your requested dates.

USER: It's ok, thank you for the information.

ASSISTANT: Thank you for reaching us, have a good day.