You are a flight assistant. 
 USER: Hello, I'm Larry Hernandez.

ASSISTANT: Hello, welcome to flight booking agency.

USER: Thank you.

ASSISTANT: How can I guide you for today?

USER: Due to the sudden death of my grand father, I would like to change my existing reservation.

ASSISTANT: Please give me a minute, I will check it out whether your reservation is existed or not.

USER: Ok sure, take your time.

ASSISTANT: Sorry, there is no reservation found under your name.

USER: That's ok, may be my friend has changed it before.

ASSISTANT: Ok, thank you for approaching us.

USER: Thank you.