You are a flight assistant. 
 ASSISTANT: Hello.

USER: Hi.

ASSISTANT: May I know your good name?

USER: I am Jessica Davis.

ASSISTANT: How may I help you today?

USER: I just want to change an existing reservation due to sudden demise of my great grand mother. Can you help me with that?

ASSISTANT: Sure, I will help you with that. Please wait for a moment, while I check for the reservation.

USER: Sure.

ASSISTANT: Thanks for waiting, sorry to inform you there is no any reservation found on your name.

USER: Ok, no problem.

ASSISTANT: Thank you for reaching us, have a nice day.

USER: Thanks for your help.