You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you today?

USER: I need to change an existing reservation due to an emergency, can you please help me out?

ASSISTANT: Sure, I am here to help you.

USER: Thank you for your response.

ASSISTANT: May I know your good name to proceed further?

USER: Sure, my name is Dennis Gonzalez here.

ASSISTANT: Please be on hold. I will check in the reservation list and revert you.

USER: Sure, I will wait.

ASSISTANT: There is no reservation found on your name in our database to change it.

USER: It's ok, thank you for your information.

ASSISTANT: Thank you for availing us.