You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I serve you today?

USER: I am Karen Mitchell. I want to change my reservation as my baseball match got postponed to the next week. Can you help me in changing?

ASSISTANT: Sure, I will help you with that. Please wait for a moment.

USER: Ok, take your time.

ASSISTANT: Thanks for waiting, sorry to inform you there is no any reservation found on your name.

USER: Its Ok. Thanks for your response.

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