You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

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

ASSISTANT: Sure, may I know your name for changing your reservation?

USER: Ashley Taylor here.

ASSISTANT: Sorry there is no reservation done previously on your name.

USER: No problem, Thank you.

ASSISTANT: Thank you for approaching us.