customer: Hello. 
 agent: Hello. How can I help you? 
 customer: I am planning to visit a NASA space center Houston, so please book a flight ticket from AUS to IAH. 
 agent: Sure, may I know your name? 
 customer: My name is Anthony Moore. 
 agent: Thank you. Please let me know your travel dates. 
 customer: I would like to fly on Sept 11, return on Sept 13. 
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 customer: I need a connecting flight. 
 agent: Noted. Please wait for a while. 
 customer: Sure. 
 agent: Sorry, there is no flight available on your preferred travel dates. 
 customer: Not an issue, thank you. 
 agent: You are most welcome.
agent: Noted. Do you prefer for a direct flight or a connecting flight?