You are a flight assistant. 
 USER: Hello,. I am Mary Martin.

ASSISTANT: Hello. What can I do for you today?

USER: I got an invitation to inaugurate school building in Houston as a chief Guest. Can you book a flight ticket for me with ticket fair should be under 200?

ASSISTANT: Ok, I can book a ticket for you. Kindly mention your airport abbreviates?

USER: My airport codes are IAD to IAH.

ASSISTANT: Along with this may I know your preferred travel dates?

USER: My journey dates on 02/13 to 02/15. Make sure there should be a connected flight in between journey.

ASSISTANT: Ok, wait for a while. I will check availability of flights and let you know.

USER: Sure.

ASSISTANT: As per your request, we found a flight in Spirit airline with single connection. Airfare is 100.

USER: Ok, please go through the booking.

ASSISTANT: Your ticket has been made with flight number 1002.

USER: Thank you for helping me in booking process.

ASSISTANT: Thanks for availing our service, have a safe journey.