You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you today?

USER: Due to a lot of fog, my cricket tournament has been postponed.I would have to change my existing reservation.

ASSISTANT: Ok, may I know your name?

USER: Can you help me to change my existing reservation which is reserved in the name of Joseph Adams?

ASSISTANT: Sure, please wait a moment.

USER: Ok.

ASSISTANT: Sorry to say, no reservation found with your name.

USER: Ok, not a problem.

ASSISTANT: Thanks for the help.

USER: Thank you for your response.

ASSISTANT: Thanks for choosing us, have a good day.