You are a flight assistant. 
 USER: Hello, My name is Dennis Martinez.

ASSISTANT: Hello, how can I help you today?

USER: As I have some adjustments being made to my scheduled appointments. Can you help me, To change my existing reservation?

ASSISTANT: Sure, please wait a moment.

USER: OK.

ASSISTANT: Sorry to inform, no reservation found with your name.

USER: OK. Thank you, For your efforts and help.

ASSISTANT: Thanks for reaching us, have a good day.