You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Myself Virginia Moore.

ASSISTANT: how may I help you today?

USER: I am planning my trip on San Francisco urgently, so I am going to change my reservation. Can you please help me for this?

ASSISTANT: Sure, we are here to help you.

USER: Sure, I will wait for your response.

ASSISTANT: Please wait for a while.

USER: Ok.

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

USER: Not a big problem, anyhow thank you very much for your service.

ASSISTANT: Thanks for reaching us, have a nice day.

USER: You are welcome.