You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you today?

USER: Can you help me to change my recent reservation?

ASSISTANT: Sure, I will help you. Please let me know with your name.

USER: John Jackson here.

ASSISTANT: Please allow me a minute.

USER: Sure.

ASSISTANT: John Jackson, I am really sorry to inform you that there is no reservation found on the given name to amend the booking.

USER: That's ok, thank you for checking.

ASSISTANT: Thank you for understanding. Thank you for reaching us. Have a great time.