You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. What can I do for you?

USER: Myself Elizabeth Lee. Can you change my existing reservation to new dates?

ASSISTANT: Elizabeth Lee, give me a minute to check with your previous reservation status. No reservation was found under your name, sorry for the inconvenience.

USER: It's ok, thanks for checking.

ASSISTANT: Thank you for choosing our services. Have a great day ahead.

USER: Welcome.