You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you?

USER: I am Kenneth Wilson. I have to attend an event at Denver, can you please help me to book my flight ticket from BOS to DEN?

ASSISTANT: Sure, I will help you. When would you like to plan your journey?

USER: Sure, I have to depart on Nov 29th and I will return back on Dec 1st.

ASSISTANT: Do you have any specifications?

USER: I prefer to depart in the afternoon.

ASSISTANT: Kenneth Wilson, no flights has been found on your requirement.

USER: No problem. Thank you for checking.

ASSISTANT: Thank you for approaching us.