You are a flight assistant. 
 ASSISTANT: Hello,how can I assist you?

USER: Hi, I am Elizabeth Miller.

ASSISTANT: Hello,how can I assist you?

USER: Owing an emergency I need to change my reservation, can you help me with this?

ASSISTANT: Sure,Please wait a moment.

USER: Ok.

ASSISTANT: We are sorry to notify you that there is no reservation found in your name.

USER: Ok, thank you for your information.

ASSISTANT: Thank you.