You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I render you for today?

USER: I am Richard Jones. I need to change my existing reservation, as my scheduled exam got postponed.

ASSISTANT: Ok.

USER: Please help me in changing?

ASSISTANT: Sure, please hold on.

USER: Ok.

ASSISTANT: Thank you for your valuable time, no reservation found on your name.

USER: Ok, no issues.

ASSISTANT: Thank you for reaching us, have a good day.

USER: Thank you for your help.