You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you today?

USER: I have planned a party with my friends but due to illness I want to change my existing reservation.

ASSISTANT: Sure, May I know your name?

USER: I am James Hill.

ASSISTANT: There is no reservation found with your name.

USER: Ok, not an issue. Thanks for your kind information.

ASSISTANT: Thanks for choosing us.