You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I serve you at this moment?

USER: Can you please help me with booking a flight ticket from DTW to DEN?

ASSISTANT: Sure, can you please share your journey dates?

USER: My travel dates are May 21 and 23.

ASSISTANT: May I know your name please?

USER: My name is Robert Thomas.

ASSISTANT: Can you please let me know your connection limit?

USER: I need a connecting flight.

ASSISTANT: Do you have any other preferences?

USER: I would like to depart at evening.

ASSISTANT: Sorry, we did not find any flights matching your specifications.

USER: Ok, no issues. Thank you.

ASSISTANT: Thank you for choosing us.