You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you now?

USER: Can you help me in booking from DFW to BOS?

ASSISTANT: Sure, I will help you with that. Can you please provide your preferable dates of travelling?

USER: My travelling dates are from Dec 25 to Dec 27.

ASSISTANT: Do you have any connection limit?

USER: I need a direct flight.

ASSISTANT: At what time are you planning to depart and return?

USER: I am flexible with any time.

ASSISTANT: Any more specifications do you have?

USER: No.

ASSISTANT: May I know your name please?

USER: My name is Sandra Clark.

ASSISTANT: Please be on hold to check the flights.

USER: Sure.

ASSISTANT: We regret to inform you that, there are no direct flights are available for your journey with your requested dates of travelling.

USER: Ok, No issues. Thank you.

ASSISTANT: Thank you for approaching us, have a great day.