You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello, Can I help you?

USER: My parent's wedding anniversary got cancelled, so I want to change my existing reservation.

ASSISTANT: Sure, can you please provide me your details?

USER: My name is Gregory Phillips.

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

USER: OK. No issue thank you for your response.

ASSISTANT: Thank you for reaching us.