You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Carolyn Rodriguez.

ASSISTANT: How may I assist you?

USER: Due to some emergency at my home, I want to change my existing reservation. Please help me with that.

ASSISTANT: Sure, I would be happy to help you. Just, give me a minute.

USER: Ok.

ASSISTANT: I am sorry to say that there is no reservation found.

USER: Ok, no problem. Thank you for your information.

ASSISTANT: Thank you. Have a nice day.