You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I am Melissa Clark. I would like to change my existing reservation due to sudden demise of my grand father. Can you please help me with this?

ASSISTANT: Sure, I am here to help you. Please wait, I will check your reservation status and let you know.

USER: Sure.

ASSISTANT: Sorry, I have not found any reservation under your name in our database.

USER: Ok, not an issue. Thank you for the information.

ASSISTANT: You are welcome and have a nice day.