You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I am Robert Hernandez. Can you please help me in booking a flight ticket from DCA to OAK?

ASSISTANT: Sure, I am here to help. Please share your planned travel dates to proceed further.

USER: I want to fly on June 25 and return on June 27.

ASSISTANT: In which class do you want me to book ticket?

USER: I am comfortable with any class.

ASSISTANT: We have a flight from Frontier airline, number 1000 and it is costing 200. Shall I proceed with it?

USER: You can proceed to booking.

ASSISTANT: Your economy class ticket has been processed.

USER: Thank you.

ASSISTANT: Thank you for opting us.