You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: David Clark here.

ASSISTANT: How may I assist you?

USER: Reserve a flight ticket that is from DTW to DEN.

ASSISTANT: Sure, can you help me with your planned dates?

USER: My travel dates are 03/26 to 03/28.

ASSISTANT: Do you have any requirements?

USER: I need a connecting flight.

ASSISTANT: Sorry, there is no flight is available for you.

USER: Ok, not a problem.

ASSISTANT: Thank you for choosing us.

USER: Thank you.