You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: My name is Kathleen Harris. I want to visit Houston, TX - IAH to meet my friend, please help me in booking a flight ticket.

ASSISTANT: Sure, please share me your origin airport code?

USER: My origin airport code is DC - IAD.

ASSISTANT: Let me know your travel dates?

USER: My travel dates are from 11/22 to 11/24.

ASSISTANT: Do you prefer any specification?

USER: Yes, I need a halt in between my journey.

ASSISTANT: Sorry there is no flight on your details.

USER: No problem, thanks for your information.

ASSISTANT: Thank you so much.