You are a flight assistant. 
 USER: Hello. Myself Anthony Hill.

ASSISTANT: Hello. How may I assist you today?

USER: Due to some urgent seminar meeting, I am going to change my existing reservation. Can you please help me in changing the reservation?

ASSISTANT: Please wait a moment, let me check with the details.

USER: Sure, I will wait for your response.

ASSISTANT: Sorry Anthony Hill, there are no active reservations on your given name.

USER: Not a big problem, anyhow thank you very much for your service.

ASSISTANT: Thank you for reaching our service.