You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, How can I bests serve you today?

USER: I am Gary Hall. My meeting got postponed as of now, so I need to change my existing reservation. Can you please help me with that?

ASSISTANT: Sure, we are here to help you to change your reservation. Please wait for sometime.

USER: Thank you. Sure.

ASSISTANT: Thanks for being hold, there was no reservation found on your name.

USER: Ok, no issue. Thank you.

ASSISTANT: Thank you for opting our agency.