You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you?

USER: Can you please help me in changing my recent reservation?

ASSISTANT: Sure, can I know your name please?

USER: My name is Gary Perez.

ASSISTANT: Ok, please hang on a moment.

USER: Ok.

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

USER: Ok, no issues.

ASSISTANT: Thanks for opting us.

USER: Thank you for your assistance.