You are a flight assistant. 
 USER: Hello, I am Mark White.

ASSISTANT: Hello, how can I help you today?

USER: I made a reservation earlier to attend a seminar but it got delayed due to some issues. Please help me in changing my reservation.

ASSISTANT: Sure. Please wait for a while.

USER: Ok.

ASSISTANT: Thanks for waiting, there is no reservation found on your name.

USER: Ok, thank you for the information.

ASSISTANT: Thank you for reaching us.