You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you at this moment?

USER: I want to change my existing reservation due to bad weather condition, can you please help me with that?

ASSISTANT: Sure, I am happy to help you with that. May I know your name for further process?

USER: My name is Andrew Collins.

ASSISTANT: Ok, please hold on a moment, I will check your previous reservation status.

USER: Sure.

ASSISTANT: There is no previous reservation available under your name.

USER: No problem, thank you.

ASSISTANT: Thank you for reaching us.