You are a flight assistant. 
 USER: Hello, I am Lisa Clark.

ASSISTANT: Hello, how can I assist you at this moment?

USER: I need to reach IAH to join the city tour with my friend. Can you book me a ticket from ORD?

ASSISTANT: Sure, please provide me your planned travel dates.

USER: i would start on Dec 27th and return on Dec 29th.

ASSISTANT: Do you prefer a halt between your journey?

USER: Yes, I need a break.

ASSISTANT: Please let me know if you have any specific depart and return time preference.

USER: No, I am okay to travel in any time.

ASSISTANT: Do you prefer either economy or business class?

USER: No.

ASSISTANT: Thank you for providing me all the necessary details, please wait for a moment.

USER: Sure.

ASSISTANT: We have found a flight from Southwest airline which departs at 5AM and it is costing 100. Please let me know if you want to proceed with it.

USER: Fine, please proceed.

ASSISTANT: Your seat is reserved in economy class, the flight number is 1018.

USER: Thanks for your support.

ASSISTANT: Thank you for choosing us as your airline agent.