You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Rebecca Evans.

ASSISTANT: How may I help you?

USER: Can you please help me to book a flight ticket from DCA to OAK?

ASSISTANT: Sure, I will help you out.

USER: Thank you.

ASSISTANT: May I know your travelling dates please?

USER: My travelling dates are 02/23 and 02/25.

ASSISTANT: Ok, please wait a moment.

USER: Ok, please check the flight with price  200 or below.

ASSISTANT: There is a flight with connection 1 and price 100, can I proceed with this flight?

USER: Ok, please book the ticket.

ASSISTANT: Ok, your ticket has been booked.

USER: Thank you for helping me.

ASSISTANT: Thank you for reaching us.