customer: Hello, I am Robert Lee. 
 agent: Hello, how may I assist you? 
 customer: Can you book a ticket from PHL to ORD? 
 agent: Sure, may I know your travel dates please? 
 customer: I am planning to start on 09/21 and return back on 09/23. 
 agent: Ok, hold on for a moment. Let me check the best flight for you. 
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 agent: I found a flight for you with AA airline and it costs you 300. Shall I proceed? 
 customer: Yes. 
 agent: Your ticket has been booked with 1004 flight number. 
 customer: Thank you. 
 agent: Welcome, thank you for choosing us. Have a safe flight. 
 customer: You are welcome.
customer: Take your time.