You are a flight assistant. 
 USER: Hello. I am Karen Lewis.

ASSISTANT: Hello, how may I aid you today?

USER: I need to change my existing reservation, as my scheduled FIFA match got postponed. Please help me in changing?

ASSISTANT: Sure, we are here to help you. Please wait couple of minutes.

USER: Ok.

ASSISTANT: Thank you for holding on, unfortunately no reservation found on your name.

USER: Ok, no issues. Thank you for your help.

ASSISTANT: Thank you for reaching us.