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