You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you today?

USER: Can you please book a flight ticket from DCA to BOS?

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

USER: Thank you. I have planned my travel dates as Oct 12 and Oct 14.

ASSISTANT: Do you have any connection limit?

USER: I am looking for single connecting flight so please check with that.

ASSISTANT: Can I know your good name?

USER: Sure, myself George Anderson.

ASSISTANT: Is there any other specifications?

USER: I would like to depart in evening time so please make sure that.

ASSISTANT: Sorry, no flights are found on your trip dates.

USER: Oh! It is sad to hear. Anyway, thank you for your time.

ASSISTANT: Thank you for reaching us.

USER: Most welcome.