customer: Hi. 
 agent: Hello. How can I help you? 
 __ 
 agent: Sure, may I know your name please for checking? 
 customer: Emma Gonzalez here. 
 agent: Ok, let me check. 
 customer: Ok. 
 agent: Sorry Emma, I have not found any reservation by your name. 
 customer: That's ok. Thank you for the information. 
 agent: Thank you for contacting us, have a great day.
customer: I want to do some changes in my existing reservation because I did not get the concert tickets, so planning to travel on another date, can you please help me?