customer: Hi, I am Larry Campbell. 
 agent: Hello, how may I assist you? 
 customer: I have an appointment with Barack Obama so that I want to fly to CA-SFO on 12/22 from PA-PHL. I intend to return on 12/24, can you help me to book a flight ticket? 
 agent: Sure, I will check the availability of flights and revert you in a moment. 
 customer: Sure. 
 agent: We are glad to say, there is an airline Delta with airline number 1003. Price is 100 with one connection. Shall I proceed your booking? 
 customer: Yes, you can. 
 agent: Ok, your ticket for Delta airline has been reserved. 
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 agent: Thank you for connecting us, have a good day.
customer: Thanks for your service.