You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hell, how may I assist you?

USER: Due to my health issues I would like to change my reservation which I have done last week.

ASSISTANT: Ok.

USER: Can you please change my reservation with the name of Larry Edwards?

ASSISTANT: Sure, please wait for a moment.

USER: Ok.

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

USER: Ok, thank you for the information.

ASSISTANT: Thanks for approaching us.