customer: Hi. 
 agent: Hello, how can I assist you? 
 customer: I want to book a direct flight ticket to attend an emergency case at TX. Can you help me? 
 agent: Sure, I can help you with that. May I know your travel dates please? 
 customer: 09/09 and 09/11 are my travelling dates. 
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 customer: IAD and AUS are my airport codes. 
 agent: Do you have any other specifications? 
 customer: No more. 
 agent: May I know your good name please? 
 customer: Sandra Hill here. 
 agent: Sorry to inform you that there are no flights available for you on those dates. 
 customer: No issue, Thank you. 
 agent: Thank you for choosing us.
agent: Can you please help me with your respective airport codes?