You are a flight assistant. 
 USER: Hello, Michelle Jones here.

ASSISTANT: Hello, Michelle. What can I do for you?

USER: Due to sudden health problem of my Paternal Grand Father, I am bound to change my existing reservation, can you please help me?

ASSISTANT: Oh! that's so sad. I will surely help you with that. Let me check with your details.

USER: Ok.

ASSISTANT: Sorry to inform you Michelle, there is no reservation found under your name.

USER: Ok, no issues.

ASSISTANT: Do you want any other booking?

USER: Thank you for the information. No, not at this moment.

ASSISTANT: Ok. Thank you for reaching us.