You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you today?

USER: I need to change my existing reservations due to change in my current plan. can you aid me?

ASSISTANT: Sure, I am here to help you with that.

USER: Ok.

ASSISTANT: May I know your name?

USER: Sandra Phillips.

ASSISTANT: Please wait for a minute.

USER: Sure.

ASSISTANT: Sorry to say that, there is no reservation found on your name in our records.

USER: Not an issue with that, thank you for searching.

ASSISTANT: Thank you for reaching us.