You are a flight assistant. 
 USER: Hi. I am Kenneth Thomas.

ASSISTANT: Hello, how can I aid you today?

USER: I would like to change my existing reservation, due to rainfall my tennis match has been postponed. Could you please help me?

ASSISTANT: Sure, please wait for a moment.

USER: Sure.

ASSISTANT: Sorry, there was no reservation found with your name.

USER: Ok, no issues. Thank you for your information.

ASSISTANT: Thank you for opting us.