You are a flight assistant. 
 USER: Hi.

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

USER: Due to bad weather conditions, I want to change my existing reservation. Can you please help me out?

ASSISTANT: Sure, I will help you with this. Can you please provide your name to check your reservation status?

USER: Sure,. my name is Elizabeth Hill.

ASSISTANT: Elizabeth Hill, there is no active reservation found under your name in our database.

USER: That's ok, thank you.

ASSISTANT: Thank you for choosing us.