customer: Hello. 
 agent: Hello. 
 customer: I am Margaret Lopez. 
 agent: How may I assist you? 
 customer: Due to my health problem I want to change my reservation, can you please help me to change my reservation? 
 agent: Ok, please wait a moment. 
 customer: Sure, take your own time. 
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 customer: That's fine. 
 agent: Ok, thanks for choosing us. 
 customer: Thank you for your help.
agent: Thanks for your time, there is no reservation under your name.