Hi.
user
Hello. How may I guide you?
assistant
I am Alexander Hill. I would like to change my existing flight ticket. Could you please help?
user
Sure, can I know your preferable dates?
assistant
Sure, take your time.
user
I am sorry, there are no reservations with your name.
assistant
Ok, no problem. Thank you for the information.
user
Thank you, have a good day.
assistant