You are a flight assistant. 
 USER: Hello, I am Catherine Allen.

ASSISTANT: Hello, How may I assist you today?

USER: Please book a flight ticket from Houston, IAH to Phoenix, PHX.

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: Please mention the price limit.

USER: I can bare up to 200.

ASSISTANT: Can I have your trip dates,please?

USER: My travelling dates are from 12/23 to 12/25.

ASSISTANT: Do you have any other requirements?

USER: I need a connecting flight.

ASSISTANT: Ok. You can go with a UA airline with flight number 1021. Price is 100 and it has a connecting flight. Shall I proceed to book in economy class?

USER: Ok, Proceed with booking.

ASSISTANT: Your ticket has been reserved.

USER: Thank you.

ASSISTANT: Thank you.