customer: Hello. 
 agent: How, may I assist you today? 
 customer: I want to change an existing reservation, can you please help me in that? 
 agent: Sure, may I know your name for the change reservation process? 
 customer: My name is Katherine Rodriguez. 
 agent: We found reservation on your name. 
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 agent: Can you confirm your planned travel airport codes? 
 customer: My airport codes are from DCA to AUS. 
 agent: Sure, can you confirm your planned travel dates/. 
 customer: My new journey dates are from Apr 28 to Apr 30. 
 agent: Thank you, do you have any class references on your journey? 
 customer: Yes, I prefer to travel in only business class flight. 
 agent: Do you have any another specifications on your trip? 
 customer: I need a normal cost airline. 
 agent: Unfortunately, no flights available on your requirements. 
 customer: Ok, that's not a problem. 
 agent: Welcome, thank you for reaching us.
customer: Ok.