You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: I just want to change my existing reservation, due to sudden demise of my grand mother. Can you please help me with this?

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: Can you please mention your name?

USER: My name is George Turner.

ASSISTANT: Sorry, no reservation found with your given name.

USER: It's ok, thank you.

ASSISTANT: Thank you for choosing us.