Hi.
Hello, how can I assist you at this moment?
I want to change my reservation which is done recently due to some problems, can you please help me?
Sure, I am happy to help you with that.
Thank you.
Can I have your good name please to check your reservation status?
Sure, my name is Angela Lewis.
Ok, please wait a  moment.
Sure, I will wait.
Yes Angela Lewis, your reservation has found so please let me know your travelling dates.
Sure, my planned dates of journey are from Jan, 19 to Jan, 21.
Ok, please let me know the airport codes of your locations.
Ok, my respective airport codes are from LAX to OAK.
Do you have any more specifications?
Yes, I need a business class.
Ok, please wait a moment.
Sure, I will wait.
Sorry Angela Lewis, no flight is available to you in business class.
Ok, no problem. Thank you for your service.
Thank you for choosing us, have a good day.