You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: Can you please help me to book a flight ticket from DEN to BOS?

ASSISTANT: Sure, please share your planned travel dates?

USER: My journey dates are Jan 13 to Jan 15.

ASSISTANT: Any other requirements to be met?

USER: I want to depart in the morning.

ASSISTANT: Let me know your connection limit?

USER: I need a single connection of flight.

ASSISTANT: Do you have any class preference?

USER: I would like to prefer economy class.

ASSISTANT: Can I have your name please?

USER: My name is Mark Thomas.

ASSISTANT: Sorry, no flights found with your given details.

USER: No problem, thanks for your information.

ASSISTANT: Thank you for reaching us.