customer: Hello. 
 agent: Hello. 
 customer: Myself Robert Hall. 
 agent: Hall, how can I assist you? 
 __ 
 agent: Let me check, Please wait for a moment. 
 customer: Sure. 
 agent: Sorry, no reservation found by your name. 
 customer: Ok, thank you for your information. 
 agent: Thank you for reaching us.
customer: Due to sudden change in my business plan, I want to change my existing reservation.