You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I support you today?

USER: I would like to change me reservation, due to my grandfather's health issue. help me in changing my reservation.

ASSISTANT: Sure, let me know your good name please?

USER: Steven Davis here.

ASSISTANT: Ok, please wait for a moment.

USER: Sure.

ASSISTANT: Thanks for waiting, no reservation found with your name to change the reservation.

USER: No problem , thank you for your quick response.

ASSISTANT: Thanks for approaching us, have a nice day.