You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you today?

USER: Please help me to book a flight ticket from MSP to DEN.

ASSISTANT: Sure, may I know your travelling dates?

USER: My trip dates are from Feb, 04 to Feb, 06.

ASSISTANT: Do you have any connection limit?

USER: I need a single connecting flight.

ASSISTANT:  Do you have any other specifications?

USER: I prefer an economy class.

ASSISTANT: Please wait a moment.

USER: Ok.

ASSISTANT: Sorry, there are no flights found on given dates.

USER: No problem, thanks for your information.

ASSISTANT: May I know your name.

USER: I am Joshua King.

ASSISTANT: Thank you for reaching our service.