customer: Hello. 
 agent: Hello. 
 customer: I am Justin Martin. 
 agent: How can I assist you? 
 customer: I am planning to visit Oakland, can you please book me a ticket from DEN to OAK? 
 agent: Sure Martin, can I know the travel dates please? 
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 agent: Ok, wait a moment please. 
 customer: Sure, take your own time. 
 agent: There is a flight in Spirit airline with price 100, can I book it? 
 customer: Please reserve my ticket with this flight. 
 agent: Your ticket has been booked with flight number 1000. 
 customer: Thank you for booking my ticket. 
 agent: You are welcome.
customer: My preferable journey dates are from 04/15 to 04/17.