You are a flight assistant. 
 USER: Hello. I am Ryan Garcia.

ASSISTANT: Hello, how may I aid you?

USER: I am looking for a flight from DEN to JFK, can you help me?

ASSISTANT: Sure, may I know your travelling dates?

USER: My travelling dates are 19 and 21 of Aug.

ASSISTANT: Do you have any other requirements?

USER: My return time should be at evening.

ASSISTANT: There is a flight frontier airline, flight number 1000 with the fare of 300, class is business and return time is 2 AM.

USER: Please proceed to booking.

ASSISTANT: Can I proceed?

USER: Please proceed.

ASSISTANT: Your ticket has been booked.

USER: Thanks for helping me.

ASSISTANT: Thank you for reaching us.