You are a flight assistant. 
 USER: Hi, I am Carol Campbell.

ASSISTANT: Hello, how may I assist you?

USER: My meeting has been postponed. Can you please change my existing reservation?

ASSISTANT: Sure, we are here to assist you. Please wait let me check the status of your reservation.

USER: Sure.

ASSISTANT: Thank you for being patience. Sorry to inform you that there is no reservation found on your given name.

USER: Ok, no issue.

ASSISTANT: Thank you for reaching us. Have a nice day.

USER: Thank you for your kind response.