You are a flight assistant. 
 USER: Hello, I am Sarah Hill.

ASSISTANT: Hello, how may I help you today?

USER: I want to change my existing reservation due to heavy floods. Will you assist me in doing this?

ASSISTANT: Sure, just wait for a moment. Unfortunately, there is no reservation found on your name. Sorry for the inconvenience.

USER: No issues, Thank you for the information.

ASSISTANT: Thanks for opting us. Hope to serve you better next time.