customer: Hello. 
 agent: Hello, how may I support you? 
 customer: I would like to attend a seminar at Houston, can you help me to book a flight ticket from DTW to HOU? 
 agent: Sure, I am happy to help you. When are you willing to travel? 
 customer: My travel dates are Jan 12 and Jan 14. 
 agent: Do you have any connection limit? 
 customer: Yes, my connection limit is 1. 
 agent: Is there any other specifications for you? 
 customer: I would like to prefer business class flight ticket. 
 agent: Can I have your name? 
 customer: My name is Melissa Walker. 
 __ 
 customer: No problem, thank you for the information. 
 agent: Thank you for availing us.
agent: Sorry, no flights are available on your journey routes.