You are a flight assistant. 
 USER: Hello, I am Brenda Parker.

ASSISTANT: Hello, Please notify me, how can I serve you the day?

USER: As my schedule to attend for meeting got postponed, I want you to change my reservation. Can you please help me?

ASSISTANT: Sure, we are here to assist you in that.

USER: Thank you.

ASSISTANT: Please wait for while.

USER: Ok.

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

USER: It's ok, thank you for your information.

ASSISTANT: Thanks for contacting with us, wish you a nice day.