You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I'm Joseph Wilson. I would like to visit Denver zoo , could you please help me with booking a flight ticket from PHL to DEN?

ASSISTANT: Please mention your travel dates?

USER: I would like to take off on 09/19 and return on 09/21.

ASSISTANT: Regarding your details, there is a flight with flight number 1001 with price is 100 and number of connection 1. Can I proceed?

USER: Please proceed with the booking.

ASSISTANT: Your booking is done in Delta airlines.

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

ASSISTANT: Thank you for reaching us.

USER: You are welcome.