You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Edwards Hernandez here.

ASSISTANT: How can I assist you?

USER: I want to change my flight reservation as my exams are postponed, can you help me?

ASSISTANT: Ok, please wait. Sorry, no reservation found on your name to change.

USER: Oh! That's sad to know. Anyways, thank you for checking.

ASSISTANT: Most welcome.