You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: I am Shirley Williams. I am planning to attend a party at Denver, help me in booking my flight ticket from CA-OAK to CO-DEN.

ASSISTANT: Sure, do you have any price limit?

USER: I can spend up to 500 in booking my flight ticket.

ASSISTANT: Help me with the dates of your travel?

USER: My trip dates will be 03/23 to 03/25.

ASSISTANT: Thank you for your details, we found a flight in an airline Frontier of number 1021. Shall I proceed to book?

USER: Please proceed with booking.

ASSISTANT: Your flight ticket has been booked. Thank you for reaching us.

USER: Thank you for your assistance.