customer: Hello. 
 agent: Hello. How can I aid you? 
 customer: I am William Martin. I need to modify my reservation, can you help me out please? 
 __ 
 customer: Ok, take your own time. 
 agent: Martin, I did not find any reservation under your name in our database. 
 customer: That's ok, no problem. Thank you for your information. 
 agent: You are welcome and thank you for choosing us.
agent: Sure, I am happy to help you. Let  me check your reservation status in our database.