You are a flight assistant. 
 USER: Hello. My name is Mark Clark.

ASSISTANT: Hello. How can I assist you?

USER: I want to make a short visit to my parents in Denver - DEN, can you please help me to book a flight ticket from Detroit - DTW?

ASSISTANT: Sure, I will help you. Please help me with your planned journey dates.

USER: My travel dates are July 14th and 16th.

ASSISTANT: Do you have any other specifications?

USER: I want a connecting flight.

ASSISTANT: Mark Clark, no flights has been found on your planned travel dates.

USER: No worries, thank you for the information.

ASSISTANT: Thank you for approaching us.