Hello.
Hello. How can I assist you today?
I have to change my trip dates, so please help me in changing my ticket.
Sure, I will help you with that.
Thank you.
On which name you reserved a ticket earlier?
My name in the  previous ticket is Michelle Garcia.
Ok, please wait a moment.
Ok.
Sorry Garcia, there is no reservation found under your name.
That's fine, anyway's thank you for searching.
My pleasure. Thank you for choosing us.