You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I am planning to attend a seminar on global warming, could you book a ticket from PHL to DEN?

ASSISTANT: Sure. Please tell me your trip dates?

USER: I am departing on 06/19 and arriving on 06/21. Make sure the price should not exceed 200.

ASSISTANT: May I know your name please?

USER: Margaret Miller here.

ASSISTANT: Ok. The flight 1029 of JetBlue airline is available for you.

USER: Please book my ticket.

ASSISTANT: Ok. Your ticket is booked.

USER: Thank you for assisting me.

ASSISTANT: Thank you for reaching us.