You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Virginia Harris here. Can you please help me with flight ticket booking from DCA to OAK?

ASSISTANT: Sure,I will help you with that.

USER: Thank you.

ASSISTANT: Please share your travel dates.

USER: Sure, I need to travel on dates of 05/19 and 05/21.

ASSISTANT: Flight 1000 of Frontier airlines is available for you.

USER: That's fine, please proceed with booking.

ASSISTANT: Your ticket is booked successfully.

USER: Thank you for your help.

ASSISTANT: You are welcome.