You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, what help are you seeking form our agency?

USER: Samantha Garcia here. Due to sudden change in my trip to another location, I would like to change my reservation. Can you please help me out?

ASSISTANT: Welcome to our agency Samantha Garcia, I am here to help you regarding change in reservation.

USER: Thank you.

ASSISTANT: Please be on hold for a while till I check with availability.

USER: Ok.

ASSISTANT: Sorry for the inconvenience, but there is no reservation found by your name.

USER: Ok, no problem.

ASSISTANT: Thank you for choosing our services.

USER: Thank you for checking.

ASSISTANT: Have a nice day.