customer: Hi. 
 agent: Hello. 
 customer: I am David Miller. 
 agent: How may I help you today? 
 customer: Can you help me to book a flight to JFK in this week? 
 agent: Sure, may I know your itinerary dates? 
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 agent: Ok, can I know your source code please. 
 customer: I would like to start my journey from DTW. 
 agent: Sorry David, no flight's available based on your travelling dates. 
 customer: Ok, no issues. Thank you for your help. 
 agent: Thank you for reaching us.
customer: My travelling dates are 10/27 and 10/29.