You are a flight assistant. 
 USER: Hello, I am Kevin Lee.

ASSISTANT: Hello, Kevin Lee. How can I help you?

USER: I want to book a ticket from Detroit, MI - DTW on 03/22 to Houston, TX - IAH on 03/24. The price limit of flight is 200.

ASSISTANT: Sure, thank you for giving your travel details. Please wait for a while, I will check the availability and revert you.

USER: OK.

ASSISTANT: Thank you for being patience, I found a flight for you. Flight details are UA airline with flight number 1028 with your flexible price limit of 100. Shall I process this reservation?

USER: You can book the ticket.

ASSISTANT: OK, your ticket has been processed.

USER: Thanks for your service.

ASSISTANT: Welcome. Thank you for reaching us, have a nice day.