customer: Hello. 
 agent: Hello, how may I assist you? 
 customer: Actually, my friend book a flight ticket in economy class instead of business class. Can you please help me in changing of my existing reservation? 
 agent: Sure, may I know your good name please? 
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 agent: Please wait for a moment. 
 customer: Ok. 
 agent: Sorry, there is no reservation found on your name in our database to change. 
 customer: Ok, no problem. Thank you for your information. 
 agent: You are most welcome.
customer: Myself Catherine Wilson.