You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: Can you help me to book a connecting flight from DEN?

ASSISTANT: Sure, can I know your travelling dates?

USER: My travelling dates are 02/25 and 02/27.

ASSISTANT: On which name should I reserve the flight ticket?

USER: Please book under this name, Alexander Mitchell.

ASSISTANT: Do you have any connection limit?

USER: I want a connecting flight.

ASSISTANT: Please let me know your destination airport code.

USER: I prefer business class to visit PHX.

ASSISTANT: Do you have any other specifications?

USER: I want to depart at evening.

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

USER: No issues, thank you for your time.

ASSISTANT: Thank you for reaching us.