Hello.
Hello. What can I do for you?
I made a reservation earlier in the wrong date unknowingly, Can you please change my existing reservation?
Sure, I am happy  to help you. Can you please tell me your name ?
I am Samuel Campbell.
Ok, please give me a moment.
Sure.
Sorry to intimate you that, I haven't found any reservation on your name to change the ticket details.
Ok, Thank you.
You are most welcome. Thank you for reaching us.