You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you?

USER: Myself Ronald Hernandez, can you help me with the flight ticket change which I did last week?

ASSISTANT: Yes, I can help you. Can you share me your travelling dates?

USER: Ok, thank you. Please check the reservation is available or not.

ASSISTANT: Give me a moment.

USER: Ok.

ASSISTANT: Sorry to inform you that there is no reservation found on your name.

USER: That's ok, thank you for the information.

ASSISTANT: Thank you for reaching us.