You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you at this moment?

USER: Myself Elizabeth Taylor. I would like to change my existing reservation, which is done recently. Can you please help me out?

ASSISTANT: Sure, I will aid you with that. Please wait a moment, I will check your previous reservation status.

USER: Thank you for considering my request and I will wait for your positive response.

ASSISTANT: There is no previous reservation available under your name.

USER: Not a big problem, anyway thank you for the information.

ASSISTANT: Thank you for reaching us.