You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Carol Brown.

ASSISTANT: How may I assist you?

USER: Can you please help me in booking a flight ticket from BOS to DFW?

ASSISTANT: Sure, I am here to help you out. May I know your travelling dates please?

USER: I want to fly Dec 30 and return on Jan 01.

ASSISTANT: Can you please share your airlines preferences?

USER: I am comfortable with any airline.

ASSISTANT: Is there any time concern?

USER: I would like to return in the morning time.

ASSISTANT: May I know your connection limit please.?

USER: I need a single connection.

ASSISTANT: Wait a moment please.

USER: OK.

ASSISTANT: Carol Brown, there are no flights available in your route.

USER: Not an issue. Thank you.

ASSISTANT: Than you for choosing us.