You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. Can you please tell me how can I assist you?

USER: Actually, I want to change my existing reservation because of heavy rainfall, can you please help me in this intent?

ASSISTANT: Ok, I can help you out.Mean while can you please tell me your name?

USER: Sure, my name is Gary Lee.

ASSISTANT: Sorry Gary, no reservation found on your name.

USER: Ok, no problem.

ASSISTANT: Thank you for reaching us.

USER: Most welcome.