customer: Hello, Jerry Smith is my name. 
 agent: Hello, how may I help you? 
 customer: Having the NHL Stanley Cup Playoffs at San Francisco, SFO. I would like to book a ticket. Could you help me in booking a flight ticket on 12/02? 
 agent: Sure, may I know your return date? 
 customer: 12/04 is my return date. 
 agent: Kindly provide your source code. 
 customer: Source code: Las Vegas, LAS. 
 agent: Unfortunately there is no flight found matching with your requirements. 
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 agent: Thank you for reaching us.
customer: Ok, no problem. Thank you for your quick response.