You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you right now?

USER: I made a reservation earlier in the business class flight now I want to travel in economy class flight. Can you help me in changing my reservation?

ASSISTANT: Sure, I am glad to help you with that. Can you please provide your name to check your previous reservation?

USER: Sure, I am Alexander Parker.

ASSISTANT: Please wait a moment to check.

USER: Sure.

ASSISTANT: We regret to notify that, there is no reservation found on your name in our records.

USER: Ok, no issues. Thank you for your information.

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