You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, what can I do for you today?

USER: I have made a reservation earlier to attend a family function but due to my grand mother's health issue it got postponed, can you please help me in making some changes in my existing reservation?

ASSISTANT: Sure, I am at your service.

USER: Thank you.

ASSISTANT: May I know your name please?

USER: My name is Christine Brown.

ASSISTANT: Please wait for a while.

USER: Ok, take your time.

ASSISTANT: I am sorry to let you know that there is no reservation available on your name.

USER: Not an issue, thank you for the information.

ASSISTANT: Thank you.