customer: Hello. 
 agent: Hello. 
 customer: I am Richard Miller. 
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 customer: I want to change an existing reservation, due to my family tour trip got postponed. Could you help me in changing a reservation? 
 agent: Ok, please wait for a while. 
 customer: Sure. 
 agent: Sorry, Richard I did not find any reservation on your name. 
 customer: Not an issue. Thank you for your response. 
 agent: Most welcome.
agent: Can you please tell me how can I assist you?