You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I aid you?

USER: I am Christopher Wilson. I have planned to go for New York to visit statue of Liberty unfortunately my grandfather met with an accident and he was hospitalised by doctors in hospital, so can you please help me in changing my existing reservation?

ASSISTANT: I am here to help you in your reservation changing.

USER: Ok, thank you.

ASSISTANT: Sorry to say this Wilson, there are no reservations under your name.

USER: Ok, fine thank you for checking.

ASSISTANT: Most welcome, thank you for reaching out here.