You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: Actually, I want to change my existing reservation which is done recently due to some problems, can you please help me out?

ASSISTANT: Sure, I am happy to help you. Please wait, let me check your reservation status.

USER: Ok, I will wait.

ASSISTANT: May I know your name?

USER: Sure, my name is Virginia Davis.

ASSISTANT: Davis, I did not find any reservation under your name in our database.

USER: Ok, no problem. Anyways, thank you for your service.

ASSISTANT: You are welcome and thank you for choosing us.