customer: Hello. 
 agent: Hello. 
 customer: My name is Larry Wilson. 
 agent: How can I help you today? 
 customer: I have a plan to meet my friend in Oakland, can you help me for booking a flight ticket? 
 agent: Sure, I will help you in booking. Can you please share your travel dates? 
 customer: My travelling dates are from 09/02 till 09/04. 
 agent: Ok, may I know your airport codes? 
 customer: My travelling airport codes are from DTW to OAK. 
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 customer: That's ok, thank you for checking. 
 agent: Welcome, have a nice day.
agent: Sorry, no flights are available on your route.