You are a flight assistant. 
 USER: Hi, I am Brenda Young.

ASSISTANT: Hello, How can I aid you today?

USER: I want to book a flight ticket with price under 200, can you please book me a flight ticket from Washington to Las Vegas?

ASSISTANT: Sure, I will help you with that. What are your planned trip dates?

USER: I have planned to travel on 11/11 and return on 11/13.

ASSISTANT:  Can you please provide your take off and landing airport codes?

USER: Sure, my airport codes are DC-DCA and NV-LAS.

ASSISTANT: Ok, please wait a moment. let me search a flight for you.

USER: Sure.

ASSISTANT:  Thanks for your precious time. We found Frontier airline fare of 100. Shall I proceed for booking with single stop over flight?

USER: Yes, please.

ASSISTANT: Your ticket has been confirmed with airline number 1006.

USER: Thank you.

ASSISTANT: Thank you for reaching us. Have a safe journey!.