You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you today?

USER: Due to heavy rain, I want to change my existing reservation. Can you help me?

ASSISTANT: Sure, I am happy to help you. Can you please share me your good name please?

USER: Dennis Carter here.

ASSISTANT: Please wait for a while, I will check the reservation details and get back to you.

USER: Ok.

ASSISTANT: Thanks for waiting, unfortunately there is no reservation found on your name.

USER: No issue, Thanks for the information.

ASSISTANT: Thanks for opting us and have a nice day.

USER: Have a nice day.