You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I aid you?

USER: My brother is unwell, so I want to change my reservation. Can you please help me?

ASSISTANT: Sure, I will help you.

USER: Thank you.

ASSISTANT: Can you please tell me your name?

USER: Sure, my name is Karen Hall.

ASSISTANT: Sorry Karen, no reservation found with your name to change your reservation.

USER: Not an issue, thank you for checking.

ASSISTANT: Thank you for reaching us.