You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you?

USER: Due to heavy rainfall, I cannot attend my meeting. Can you help me to change my existing reservation?

ASSISTANT: Yes, I can help you. Can I know your name for checking your previous reservation?

USER: Sure, my name is Nancy Rodriguez.

ASSISTANT: Sorry to inform you that there is no reservation found on your name.

USER: That's ok, thank you.

ASSISTANT: Thank you for reaching us.