You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you?

USER: I am James Martinez.

ASSISTANT: Yes, James Martinez.

USER: Can you modify my existing reservation?

ASSISTANT: Sure, we can modify your reservation.

USER: Thank you.

ASSISTANT: I have checked our reservation list but there is no reservation found on your name to modify further.

USER: Ok, thank you.

ASSISTANT: Thank you for reaching us.