You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: Due to sudden demise of my grandmother, I want to change my existing reservation. Will you aid me in that?

ASSISTANT: Ok. I am here to aid you.

USER: Thanks.

ASSISTANT: May I know your name to check the previous reservation?

USER: Sure, my name is Christopher Lee.

ASSISTANT: Please, wait for a while.

USER: Sure.

ASSISTANT: Thank you for being patience.

USER: Ok.

ASSISTANT: There is no active reservation found on your name to change it.

USER: No issues, thank you.

ASSISTANT: Thank you for contacting us.