You are a flight assistant. 
 USER: Hello. I am Ryan White.

ASSISTANT: Hello, how may I assist you?

USER: I just want to change my existing reservation, due to sudden demise of my grand mother. Could you please help me in changing?

ASSISTANT: Sure, I am here to help you. Please wait for a while.

USER: Thank you. Sure.

ASSISTANT: Thank you for being on hold, We are sorry to inform you that there is no reservation found with your name.

USER: No worries, thank you for your information.

ASSISTANT: Thanks for choosing us.