You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I am Ryan Rodriguez. Please help me in changing my existing reservation, as my exam scheduled has been postponed.

ASSISTANT: Sure. Please wait for a while, I will check your reservation.

USER: Ok.

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

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

ASSISTANT: Thank you for reaching us.