You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you?

USER: I am Matthew Hernandez. As my exam is postponed, I want to change my reservation. Can you help me?

ASSISTANT: Wait a moment please, let me check the reservation status.

USER: Ok.

ASSISTANT: Matthew Hernandez, there is no reservation found with your name in our database.

USER: No issue, thank you for checking.

ASSISTANT: Thank you for contacting us.