You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I be your helping hand?

USER: Due to sudden demise of my grand father, I want to change my existing reservation. Can you please assist me?

ASSISTANT: Sure, I can help you in this.

USER: Thank you.

ASSISTANT: May I know your name to check the reservation status?

USER: I am Thomas Thompson.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Thanks for your time, there is no active reservation found on your name to change it.

USER: Ok, no issues. Thanks for your information.

ASSISTANT: Thanks for approaching us.