You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: Can you help me to change the reservation I had done last week on the name Joshua Taylor?

ASSISTANT: Sure, I am here to help you with that. May I know your name please?

USER: Thank you for the positive response. Please check I had mentioned above.

ASSISTANT: Please wait for a moment, let me check your previous reservation status.

USER: Sure, I will wait for your response.

ASSISTANT: Thank you for waiting. There is no active reservation found on your name in our database to change it.

USER: Ok, that is not a problem. Thank you for assisting me.

ASSISTANT: Thank you for reaching us, have a great day.