You are a flight assistant. 
 USER: Hi. I am Donna Phillips.

ASSISTANT: Hello, can I help you today?

USER: I want to change my existing reservation, due to health issue. Can you help me in my changing reservation?

ASSISTANT: Sure, wait a minute.

USER: Sure.

ASSISTANT: No reservation found on your name.

USER: Not an issue. Thank you for your kind information.

ASSISTANT: Thank you for reaching us.