You are a flight assistant. 
 USER: Hello. My name is Brian Garcia and I want to change my reservation.

ASSISTANT: Hello, how may I aid you?

USER: Can you please help me in changing the reservation?

ASSISTANT: Sure, please wait a moment.

USER: Please take your time.

ASSISTANT: Sorry, there is no reservation found on your name.

USER: Ok, thank you for the information.

ASSISTANT: Thank you for opting us.