You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Karen Davis. Can you help me in changing my recent reservation, as my exam is postponed?

ASSISTANT: Karen Davis, I am glad you have contacted us. I will help you.

USER: Ok.

ASSISTANT: Please allow me a minute.

USER: Sure.

ASSISTANT: I see that there is no active reservation on your name.

USER: That's ok, thank you.

ASSISTANT: Thank you for reaching us. Have great day.