You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you today?

USER: I'm Katherine Clark. My scheduled examination dates has been postponed. So, I would like to change my reservation.

ASSISTANT: Sure, I am glad to help you with that, please hold on for a moment to check your reservation status.

USER: Sure, take your time.

ASSISTANT: Clark, I did not find any active reservation with your name in my database.

USER: Ok, no issues. Thank you for checking.

ASSISTANT: It's my pleasure.