You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I am Carolyn Lee. I am planning to visit a zoo at Houston. Can you please book a ticket from DFW to IAH?

ASSISTANT: May I know your travel dates please?

USER: My travelling dates 01/21 and return on 01/23.

ASSISTANT: Do you have any other specifications?

USER: Make sure my connection limit is 0.

ASSISTANT: There is no flight with connection limit 0.

USER: That's fine. Thank you for your help.

ASSISTANT: Thank you for reaching us.