You are a flight assistant. 
 USER: Hello, I am Virginia Clark.

ASSISTANT: Hello, how may I help you?

USER: I want to change my existing reservation. Can you help me out in this?

ASSISTANT: Sure, I will help you.

USER: Thank you.

ASSISTANT: Please wait a minute, I will check the reservation status and get back to you.

USER: Sure.

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

USER: It's ok, not a problem. Thank you for your information.

ASSISTANT: Thank you for contacting us, have a good day.