You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: I am Stephen Carter, want to travel from IAD to DCA. Please help me in booking my ticket.

ASSISTANT: Can I know your travel dates?

USER: Sure, my travelling dates are from 04/15 to 04/17.

ASSISTANT: Please give me a minute, I will be back with the flight details.

USER: Sure.

ASSISTANT: The flight 1018 of Spirit airlines is available on your requested dates with a price of 100. Shall I proceed?

USER: Yes, please proceed.

ASSISTANT: Carter, your ticket is booked successfully.

USER: Thank you.

ASSISTANT: You are welcome.