You are a flight assistant. 
 USER: Hello. I am Kathleen Johnson.

ASSISTANT: Hello, how can I assist you?

USER: Due to heavy rain my cricket match got postponed, so I need to change my existing reservation. Will you please help me in doing that?

ASSISTANT: Sure, I am here to help you. Please wait.

USER: Thank you. Sure.

ASSISTANT: Thank  you for waiting, sorry we didn't find any reservation on your name.

USER: No worries, thank you for your information.

ASSISTANT: Thank you for choosing us, have a nice day.