You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I serve you?

USER: I am Robert Hernandez, I plan a trip to Las Vegas to meet my high school friend. Can you help me to book a flight under fare of 200?

ASSISTANT: Sure, we are ecstatic to help you. When do you want to travel?

USER: I will fly on 07/12 and returning on 07/14.

ASSISTANT: Do you need a lay by in between your journey?

USER: Yes, I need a halt in between the journey.

ASSISTANT: Help me with your airport codes please.

USER: Sure, my destination is NV-LAS and source is Washington DC-DCA.

ASSISTANT: Give me a minute, I will check the flight availability and get back to you.

USER: Sure.

ASSISTANT: Thanks for giving your valuable time. There is a flight found with single connection and fare 200. Flight number is 1029 and airline is Hawaiian.

USER: It is good, please proceed with booking.

ASSISTANT: Your booking has been done successfully.

USER: Thank you for helping me.

ASSISTANT: Thank you for opting us.