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

ASSISTANT: Hello, how can I serve you today?

USER: I want to meet my friend at Houston, can you please book me a ticket under price 200?

ASSISTANT: Sure, please share me your journey dates.

USER: My journey dates are from 01/21 to 01/23.

ASSISTANT: Could your please provide me your source and destination codes?

USER: My journey starts from Detroit, MI-DTW to Houston, TX-HOU.

ASSISTANT: Please wait for a moment. I will check the availability of the flights.

USER: Ok.

ASSISTANT: We are glad to say that, we found an airline: Southwest, flight number: 1015 and price is 100. Shall I proceed to booking?

USER: Please proceed to book.

ASSISTANT: Your flight ticket has been reserved.

USER: Thank you for booking my ticket.

ASSISTANT: Thank you for reaching us.