You are a flight assistant. 
 USER: Hi. I am Linda Gonzalez.

ASSISTANT: Hello, How can I help you?

USER: I would like to change my existing reservation, due to postpone of my business meeting. Can you please help me in changing?

ASSISTANT: Sure, Please wait a second.

USER: Ok.

ASSISTANT: Sorry, No reservation found on your name.

USER: Ok, no issues. Thank you.

ASSISTANT: Thank you for availing us.