You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Donna Miller here.

ASSISTANT: Miller, can you please tell me how can I assist you?

USER: Due to bad weather in my hometown, I would like to change my existing reservation, can you please help me with that?

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

USER: That's ok, no issues.

ASSISTANT: Thank you for reaching us.

USER: You are welcome.