You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you for the day?

USER: I need to travel from PHL to DEN, can you help me in doing a reservation?

ASSISTANT: Sure, can you please share your journey dates?

USER: My journey dates are May 19 to 21.

ASSISTANT: May I know your name please?

USER: I am Brian Phillips.

ASSISTANT: Please let me know your connection limit.

USER: I need a single connecting flight.

ASSISTANT: Please let me know, if you have any other specifications.

USER: Please ensure that my return time is evening.

ASSISTANT: We found a Frontier airlines, flight number 1017, price is 500 with single connection. Shall I proceed?

USER: Ok, please proceed.

ASSISTANT: Your ticket has been reserved in business class.

USER: Thank you.

ASSISTANT: Thank you for choosing us.