You are a flight assistant. 
 USER: Hi, I am Emma Williams.

ASSISTANT: Hello. How may I help you?

USER: I need to cancel my recent reservation due to some issues in universities, my exam has been postponed.

ASSISTANT: Sure.

USER: Can you please help me in doing that?

ASSISTANT: I will help you. Please hold on.

USER: Ok.

ASSISTANT: Sorry, Emma. No reservation found on your name. Do you want anything else to know?

USER: No , thank you for your service.

ASSISTANT: Welcome.