You are a flight assistant. 
 USER: Hello, I am Dorothy Clark.

ASSISTANT: Hello, how may I serve you today?

USER: Due to bad weather condition, I want to change my reservation. Can you help me with it.

ASSISTANT: Sure, please hold on a moment, I will let you know.

USER: Sure.

ASSISTANT: Thanks for waiting, we have not found any flight reservation with your given name.

USER: No issues. Thank you.

ASSISTANT: Thank you for opting us.