You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I oblige you today?

USER: Due to sudden demise of mu grandfather, I want to change the dates in my existing reservation. Can you aid me?

ASSISTANT: Sure, we can help with that.

USER: Thank you.

ASSISTANT: Please provide your good name?

USER: Sure, please check with the name David Jones.

ASSISTANT: Just wait for a moment.

USER: Sure, I will wait for your response.

ASSISTANT: Thank you for waiting, there is no active reservation found with the given name.

USER: That's ok, not an issue. Thank you for checking.

ASSISTANT: Thank you.

USER: Thank you for connecting us.