customer: Hello. 
 agent: Hello. How may I guide you today? 
 customer: I am Ruth Gonzalez here. I want to change my previous  travelling dates. Can you please help me out in changing my existing  reservation? 
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 customer: Thank you for considering my request. 
 agent: Please wait for a minute. 
 customer: Sure, I will wait for your response. 
 agent: I am sorry to say that there is no reservation found under your name. 
 customer: Not a problem, anyway, thank you for the information. 
 agent: Thank you for reaching us, have a great day.
agent: Sure, I will help you with that.