You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I guide you now?

USER: I am Virginia Young. I want to change my existing reservation as my trip got postponed. Please help me out.

ASSISTANT: Virginia Young, can you please hold on for a moment.

USER: Ok.

ASSISTANT: Let me check with availability of your previous booking. I tried to check check with your existing reservation in our data base. But I could not find any active reservation under your name.

USER: No problem, thanks for the help.

ASSISTANT: Thank you for approaching our services. Have a safe journey.