You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Elizabeth Clark.

ASSISTANT: 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 will aid you in changing your reservation.

USER: Thank you.

ASSISTANT: Just give a moment.

USER: Sure.

ASSISTANT: Sorry to inform this, there is no active reservation on your name in our records.

USER: No problem, thank you.

ASSISTANT: Thank you for reaching us.