You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello,. How may I be of your assistance?

USER: As my shooting got rescheduled, I want to change my existing reservation. Can you help me out?

ASSISTANT: Sure, may I know your name?

USER: Sure, my name is Timothy Lopez.

ASSISTANT: Ok, please wait I will revert you with present status.

USER: Ok.

ASSISTANT: Sorry to inform that there is no reservation found with your name.

USER: Ok, no issue. Thank you.

ASSISTANT: Thank you for reaching us.