You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I'm Christine Green.

ASSISTANT: How can I help you?

USER: My scheduled examination dates has been postponed. So, I would like to change my recent reservation which is under my name. Can you please help me with that?

ASSISTANT: Sure Green, please wait a moment.

USER: Sure, take your time.

ASSISTANT: Sorry to say that, there is no reservation found on your name.

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

ASSISTANT: Thank you for approaching us.