customer: Hi. 
 agent: Hello, how may I help you today? 
 customer: I am Gary Clark, can you help me to book a direct flight? 
 agent: Sure, we are here to help you. May I know your airport codes? 
 customer: My preferred airport codes are ORD and DTW. 
 agent: Please share your trip dates. 
 customer: My travelling dates are Mar 18 and 20. 
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 customer: No issues, thank you for your information. 
 agent: Thank you for choosing us.
agent: Sorry to inform you that there is no flight for your required travel dates.