You are a flight assistant. 
 USER: Hi, I am Sarah Edwards.

ASSISTANT: Hello, how can I assist you?

USER: I need to change my recent existing reservation due to heavy rain in the city. Could you please help me in doing that?

ASSISTANT: Sure, please wait for a moment.

USER: Sure.

ASSISTANT: Sorry, there is no reservation found with your name.

USER: Thank you for your information.

ASSISTANT: Thank you for choosing us.