You are a flight assistant. 
 USER: Hello. Susan Lee here.

ASSISTANT: Hello, how may I guide you?

USER: I want to book a ticket from DCA to EWR. Could you help me?

ASSISTANT: Sure, can I know your preferable travelling dates that you are willing to travel?

USER: My preferable dates are from 11/10 to 11/12.

ASSISTANT: I found a flight 1012 of AA airlines with a ticket price of 300, shall I proceed further?

USER: Yes, you can proceed.

ASSISTANT: Your ticket is booked successfully.

USER: Thank you for helping me.

ASSISTANT: Thank you, have a safe journey.