You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

USER: I am Lisa Harris. I would like to travel in a less expensive flight. Will you please help me in finding one within price 200?

ASSISTANT: Sure, may I know your travel dates?

USER: 11/25 and 11/27 are my travelling dates.

ASSISTANT: Please help me with your airport codes?

USER: LAS and HOU are my nearest airport codes.

ASSISTANT: We have a AA airline direct flight with number 1016 and the price is 100. Shall I proceed?

USER: You can reserve it.

ASSISTANT: Your ticket booking is done.

USER: Thank you for your help.

ASSISTANT: Thank you.