You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you at this moment?

USER: I'm Jessica Williams. My scheduled examination dates has been postponed. So, I would like to change my reservation which is under my name.

ASSISTANT: Sure, wait a moment. Let me check the database and get back to you.

USER: Sure, take your time.

ASSISTANT: Jessica Williams, there are no active reservation found under your name to change it.

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

ASSISTANT: Thank you for utilising our service.

USER: You are welcome.