You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I assist you for the day?

USER: Please book a flight ticket from BOS to DEN.

ASSISTANT: When you are willing to travel?

USER: I want to travel from Mar 30th to Apr 1st.

ASSISTANT: Do you have any connection limit?

USER: I need a connecting flight.

ASSISTANT: Do you have any class preference?

USER: I prefer to travel in economy class.

ASSISTANT: May, I know your good name?

USER: I am Linda Carter.

ASSISTANT: Sorry, we found no flights on your given dates.

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

ASSISTANT: Thank you for reaching us.