You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Myself James Allen.

ASSISTANT: How may I guide you?

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

ASSISTANT: Sure, I will help you. Please wait a moment.

USER: Thank you.

ASSISTANT: James, no reservation has been found on your name in our records.

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

ASSISTANT: Thank you for choosing us.