You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I guide you for today?

USER: Owing to an emergency I had to request for this change reservation.

ASSISTANT: I am glad to help you in changing your reservation. Could you please let me know your name to check the reservation status with your name?

USER: My name is Donna Taylor.

ASSISTANT: Sorry to say this Donna Taylor, after checking in our booking list under your name I am not able to find even a single reservation.

USER: Thank you.

ASSISTANT: You are welcome, thank you for reaching us.