You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I support you?

USER: Can you aid me in booking a flight ticket from PHL to DEN?

ASSISTANT: Sure, may I know your itinerary dates?

USER: Sure, I would like to go on July 05th and return back on July 07th.

ASSISTANT: Is there any airline preference for you?

USER: Ensure it is in the business class.

ASSISTANT: May I know your depart time and arrival time?

USER: Make sure the depart time is in the evening.

ASSISTANT: Do you need any way station in your journey?

USER: Ensure it is a single connecting flight.

ASSISTANT: On whose name, I have to reserve this flight ticket?

USER: Reserve the ticket on the name of Betty Perez.

ASSISTANT: Sorry to inform you that, there are no flights available with your requirements.

USER: That's ok, thank you for checking the availability.

ASSISTANT: Thank you for reaching us.

USER: Welcome.