You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how can I assist you?

USER: I am Joseph Rodriguez.

ASSISTANT: Ok.

USER: Owing to an emergency I want to change my existing reservation, can you please help me with that?

ASSISTANT: Sure, I would be happy to help you. Please give me a moment, I will check and revert to you.

USER: Ok.

ASSISTANT: We are very sorry to inform, there is no reservation found on your given name.

USER: Ok, no issues.

ASSISTANT: Thank you for choosing us.

USER: Thanks for your information.