You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I guide you now?

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

ASSISTANT: Ok, please mention your good name so, I can check with your previous reservation.

USER: Sure, my name is Ruth Lewis.

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: Sorry, there is no flight reservation available in the reservation list.

USER: Ok, no problem.

ASSISTANT: Thank you for choosing us.

USER: Thank you for checking.

ASSISTANT: Most welcome.