customer: Hello. 
 agent: Hello. 
 customer: Myself Sandra Davis. 
 agent: Sandra Davis, how may I aid you? 
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 agent: Sure, please hold on for a while. 
 customer: Ok, I will wait for your response. 
 agent: Sorry, no reservation is available by your name. 
 customer: Not an issue, anyhow thank you very much for your service. 
 agent: Thank you for reaching us. 
 customer: You are welcome.
customer: I am willing to change my reservation. Can you please help me for this?