You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I want to book a flight ticket for round trip Houston, TX-HOU. Could you please help me with booking a flight ticket?

ASSISTANT:    Ok, please share your travelling dates.

USER: I want to travel on dates 09/21 and 09/23.

ASSISTANT: Do you need any halt in between the journey?

USER: I need a halt in between the journey.

ASSISTANT: May I know your name please?

USER: I am Lisa Mitchell.

ASSISTANT: Sorry we didn't find any flights with your details.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for reaching us, have a nice day.