You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today?

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

ASSISTANT: Sure, can you share your trip dates?

USER: Thank  you. I have  planned my travel dates as Nov 24 and Nov 26.

ASSISTANT: Do you have any connection limit?

USER: I am  looking for single connecting flight.

ASSISTANT: Is there any class preference?

USER: No, I do not have any other specifications.

ASSISTANT: Please forward your name.

USER: Sure, myself Jonathan Walker.

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

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

ASSISTANT: Thank you.

USER: Most welcome.