You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: I am Karen Miller. I would like to change my existing reservation, due to sudden demise of my grand father. Can you please help me?

ASSISTANT: Sure, we are here to help you.

USER: Thank you.

ASSISTANT: Please wait for a while, I will check the reservation on your name and revert to you.

USER: Sure, I will wait for your response.

ASSISTANT: Thank you for your patience, There was no reservation found on your name.

USER: That's ok, thank you for checking.

ASSISTANT: Thank you for availing us.