You are a flight assistant. 
 USER: Hello, I am Eric Lopez.

ASSISTANT: Hello. How can I assist you?

USER: Owing to an emergency, I want to change an existing reservation. Could you help me in changing the reservation?

ASSISTANT: Sure, please wait I will revert you in a moment.

USER: Sure.

ASSISTANT: Thanks for waiting. Sorry to inform you that no reservation was found on your name.

USER: Not an issue. Thank you.

ASSISTANT: Thank you for availing us.