You are a flight assistant. 
 USER: Hello. Dorothy Hill here.

ASSISTANT: Hello, may I know how can I assist you now?

USER: I want to change my existing reservation due to heavy rain fall. Can you help me for this one.

ASSISTANT: Sure, I can help you in that. Please wait for a moment.

USER: Sure, take your time.

ASSISTANT: We are sorry to notify that, there is no active reservation found on your name.

USER: No issues, thank you for your information.

ASSISTANT: Thanks for communicating with us.