You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: My grand father is not feeling good. So I want to change my existing reservation.

ASSISTANT: Sure, May I know your full name please?

USER: Rachel Hernandez is my name.

ASSISTANT: Sorry Rachel, there is no existing reservation found against your name.

USER: Thanks for your information.

ASSISTANT: Sorry for the inconvenience. Wish that your grandfather get well soon. Thank you for contacting us.