You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: Can you help me in changing my existing reservation?

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: May I know your name please to check your reservation status?

USER: I am Mary Hernandez.

ASSISTANT: Please hold on a moment.

USER: Sure.

ASSISTANT: Mary Hernandez, no reservation has been found on your name in our database.

USER: Ok, no issues. Thanks for the information.

ASSISTANT: Thank you for reaching us.