customer: Hi. 
 agent: Hello. How can I support you? 
 customer: I want to book a ticket from New York to Denver. 
 agent: Sure, to book a ticket may I know when you are planning to travel? 
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 agent: Can you please share me your airport codes? 
 customer: LGA and DEN. 
 agent: Do you have any other requirements? 
 customer: I would like to prefer business class. 
 agent: Please provide your name. 
 customer: My name is Donna Gonzalez. 
 agent: We are sorry to inform you that there is no flight available on your route according to your given details. 
 customer: Thank you. 
 agent: Thank you.
customer: Travelling dates are Mar, 29 and Mar, 31.