customer: Hello. 
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 customer: I am Alexander Wilson. Can you please book a flight ticket from CLT to DTW? 
 agent: Sure, I am here to help you out. Please provide me your trip dates. 
 customer: Yes, my travel dates are 04/19 and 04/21. 
 agent: Sorry Wilson, there is no flight in your route. 
 customer: That's ok, no problem. Thank you for your information. 
 agent: Thank you for reaching us.
agent: Hello, how may I guide you?