You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you?

USER: I am Samantha Martin. I would like to change my existing reservation, due to examination schedule postponed. Can you please help me?

ASSISTANT: Sure, please wait while I fetch your current reservation in our system.

USER: Sure, take your own time.

ASSISTANT: Sorry, no reservation found on your name.

USER: That's ok, thank you for checking.

ASSISTANT: Thank you.