You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how can I help you?

USER: I am Virginia Garcia. Due to some issue I want to change my existing reservation. Will you help me?

ASSISTANT: Sure, I am here to help you? Give me a minute, let me check with it.

USER: OK.

ASSISTANT: Sorry! I didn't find any reservation on your name. Thank you for reaching us.

USER: It's OK.

ASSISTANT: Have a safe day.

USER: Thank you for your kind information.