You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I guide you right now?

USER: Myself Carol Thomas, I need to change my existing reservation, due to some inconvenience of travel dates. Can you please help me out?

ASSISTANT: Sure, I will help you.

USER: Thank you.

ASSISTANT: Carol, please allow me a moment.

USER: Sure, I will wait for your positive response.

ASSISTANT: Sorry, there is no reservation with your name to change further.

USER:  That's ok no problem, it might be changed by my father, but he didn't  inform me.

ASSISTANT: Thank you for consulting us, have a great day.

USER: Anyway, thank you for searching.