You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: My name is Sandra Rodriguez. I want to change my existing reservation due to heavy rainfall.

ASSISTANT: Sure, we are here to help you. Please hold a moment.

USER: Sure.

ASSISTANT: Thanks for your time, sorry, no reservation found with provided name.

USER: No problem, thanks for your quick response.

ASSISTANT: Thank you for approaching us.