You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, what can I serve you for today?

USER: I am Edward Hernandez. I want to change my recent reservation due to sudden demise of my great grandfather.

ASSISTANT: Sure, I am here to assist you. Give me a moment to check existing reservation.

USER: Sure.

ASSISTANT: Sorry, there is no reservation under your name in our listings.

USER: Okay. Thanks for your response.

ASSISTANT: My pleasure, thank you for opting our service. Hope you have a great day ahead.