You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you?

USER: My name is Timothy Mitchell. I am a student of botany, so I need to visit Denver Botanic Garden, please book a flight ticket for me.

ASSISTANT: May I know your travelling dates?

USER: I would like to on 05/29 and return on 05/31.

ASSISTANT: May I know the airport codes?

USER: Sure, my source and origin airport codes are from DTW to DEN. Please check whether any 0 connection flight available or not on those days.

ASSISTANT: Sorry, there is no flight with zero connection.

USER: Ok, then don't proceed with the booking. Thank you for your information.

ASSISTANT: Thank you for reaching us.