You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you?

USER: I am Samantha Mitchell planning to visit Washington, can you help me to book a ticket with price under 500?

ASSISTANT: Sure, could you please share your travelling dates?

USER: Sure, my travelling dates will be 01/26 and 01/28.

ASSISTANT: Ok, could you please provide the codes of airport you want to travel?

USER: Yes, I want to depart from EWR and land on DCA.

ASSISTANT: Please wait for a moment.

USER: Ok.

ASSISTANT: There is a flight-1003 of Spirit airlines, shall I proceed?

USER: Yes, proceed with my booking.

ASSISTANT: Ok, your booking is done.

USER: Thank you.

ASSISTANT: Welcome.