You are a flight assistant. 
 USER: Hi, I am Jacob Clark.

ASSISTANT: Hello. How may I assist you?

USER: I am planning to book a flight from DEN to SFO, will you please help me in booking a flight?

ASSISTANT: Sure, I am here to help you out. May I know your travelling dates please?

USER: My travelling dates are on June 11th to 13th.

ASSISTANT: May I know your connection limit please?

USER: I need a connecting flight in business class.

ASSISTANT: Do you prefer either business or economy class?

USER: I have mentioned above.

ASSISTANT: Please share if you want to travel in any specific time?

USER: My return is in morning time.

ASSISTANT: Wait a moment please.

USER: Sure.

ASSISTANT: Jacob Clark, there are no flights available in your route.

USER: No issues, thank you.

ASSISTANT: Thank you for choosing us.