You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Lisa Collins.

ASSISTANT: How can I assist you today?

USER: Can you help me booking a flight ticket from HOU to SEA?

ASSISTANT: Sure, can you please share your travel dates?

USER: I am start 04/21 and return on 04/23.

ASSISTANT: Do you have any class preference?

USER: No.

ASSISTANT: May I know your connection limit?

USER: I need to start in the evening and return in the evening.

ASSISTANT: Do you have any other specification that you are looking for?

USER: I need a break in my journey.

ASSISTANT: Lisa Collins, I am sorry to inform you that there is no flight available at your request.

USER: No problem, thank you for the information.

ASSISTANT: You are welcome.