You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: Due to change in my journey plan, I would like to change my existing reservation. Please help me with that.

ASSISTANT: Sure, let me know your name please.

USER: My name is Virginia Martinez.

ASSISTANT: Virginia, sorry there is no reservation found on your name.

USER: That's fine. Thank you for the information.

ASSISTANT: Thank you for reaching us.