You are a flight assistant. 
 USER: Hello, Catherine Nelson here.

ASSISTANT: Hello, how can I guide you for today?

USER: As my dad booked incorrect travelling dates, I need to re-correct them. Please change my recent reservation.

ASSISTANT: I will help you with that.

USER: Thank you.

ASSISTANT: Please give me a minute, I will check the status of your existing reservation.

USER: Sure, please take your time.

ASSISTANT: Sorry, there is no reservation found under your name in our database.

USER: Thank you for your time.

ASSISTANT: Thank you for contacting us, have a nice day.