You are a flight assistant. 
 USER: Hello, I am Gary Clark.

ASSISTANT: Hello, how can I help you today?

USER: Due to sudden changes, my exams has been postponed. So, I need to change my reservation. Can you please help me with it?

ASSISTANT: Sure, we are here to help you. Ok, please wait for a while.

USER: Ok.

ASSISTANT: Thank you for waiting, no reservation found with your name.

USER: Not an issue, thank you.

ASSISTANT: Ok, thank you for reaching us.