You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you?

USER: Can you please help me in booking my flight ticket from BOS to DEN?

ASSISTANT: Sure, I will help you in booking the ticket. May I know your travelling dates please?

USER: Sure, my travelling dates are from 11/12 to 11/14.

ASSISTANT: Do you have any other specifications?

USER: Yes, my depart time should be in the evening. Also, I need a single connecting flight.

ASSISTANT: Please help me with your name for booking.

USER: Anthony Collins.

ASSISTANT: Sorry for this inconvenience, I could not find any flight with your requirements.

USER: That's ok, thank you for your information.

ASSISTANT: Thank you for reaching us.