You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello,. How shall I help you?

USER: I need to spend more time with my parents, so I would like to change my existing reservation.

ASSISTANT: Please let me know your name.

USER: Sure, my name is Debra Miller.

ASSISTANT: I'm sorry, no reservation found.

USER: Ok, not an issue.

ASSISTANT: Thanks.

USER: Thank you for your information.