You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: I'm Nicole Taylor. My examination scheduled dates has been postponed.So, I would like to change my existing reservation. Can you please help me with that?

ASSISTANT: Sure, give me a minute.

USER: Sure, take your time.

ASSISTANT: Sorry, there is no reservation found.

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

ASSISTANT: Thank you.

USER: You are welcome.