You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Anthony Lewis.

ASSISTANT: How may I guide you now?

USER: I am planning to visit Museum of Nature and Science at Denver, could you please help me with booking a flight ticket from PHX to DEN?

ASSISTANT: Anthony Lewis, can you please tell your trip dates?

USER: I would like to depart on Apr 28th and return on Apr 30th.

ASSISTANT: May I know your departing and arrival time for this journey?

USER: Make sure that my return time must be afternoon.

ASSISTANT: May I know your connection limit?

USER: I need a connecting flight.

ASSISTANT: Any other preferences from your side?

USER: No.

ASSISTANT: Flight-1011 is available for you with UA airline in economy class with 1 connection. Can I book it?

USER: Yes, please confirm the booking.

ASSISTANT: Your ticket is reserved, thank you for choosing us.

USER: I really appreciate your help, thank you for your service.

ASSISTANT: Have a safe journey.