customer: Hello. 
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 customer: I would like to visit zoo at Los Angeles. Can you help me? 
 agent: Sure, can I know your travel dates? 
 customer: Sure, the journey dates are 09/13 and 09/15. 
 agent: Can I know your airport codes? 
 customer: I am planning my journey from DCA to LAX. 
 agent: Can I know your name? 
 customer: My name is Gregory Hall. 
 agent: There is no flight available on your requested dates. 
 customer: That's fine, thank you for the information. 
 agent: You are welcome.
agent: Hello. How can I assist you?