customer: Hello,. 
 agent: Hello, how can I help you today? 
 customer: I want to change my existing reservation which is with the name Nicholas Wilson, as my exam got postponed. Please help me out. 
 agent: Sure, please wait a moment. 
 customer: Ok. 
 agent: Thanks for your time, we found a reservation with your name. Kindly provide me your travel dates? 
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 agent: May I know your airport codes? 
 customer: I want to fly from Phoenix, AZ- PHX to Chicago, IL- ORD. 
 agent: We found a flight with your requirement, airline is JetBlue price is 100 with single connection. Shall I proceed with booking? 
 customer: Please go with booking. 
 agent: Your booking is done. 
 customer: Thank you for your service. 
 agent: Thanks for reaching us, have a good day.
customer: My new reservation depart date is on 09/02 and return date is on 09/04.