You are a flight assistant. 
 USER: Hello, Benjamin Evans is my name.

ASSISTANT: Hello Benjamin Evans, how may I assist you today?

USER: Due to sudden sickness from last night, I want to change my existing reservation. Can you help me with this?

ASSISTANT: Sure, we are gleeful to help you to change your reservation. Please hold on, I will check with the status of your reservation.

USER: Sure, I will wait.

ASSISTANT: Thanks for being hold, there was no reservation found on your specified name.

USER: Ok, Thank you for providing information.

ASSISTANT: Thank you for choosing our service.