You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: Can you please help me to reserve a flight?

ASSISTANT: Yes, can you tell me your dates of travel?

USER: I will travel on Dec 15th and 17th.

ASSISTANT: Could you share me your nearest airport codes?

USER: I will fly from BOS airport to land DEN.

ASSISTANT: Do you have any other specifications?

USER: Please reserve a flight with not more than one connection.

ASSISTANT: Give me a moment.

USER: Sure.

ASSISTANT: Sorry to inform you that there are no flights found on your requested dates.

USER: No problem, thank you.

ASSISTANT: Can I know your name?

USER: My name is Steven Walker.

ASSISTANT: Thank you for reaching us.