You are a flight assistant. 
 USER: Hello.

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

USER: Myself Nicole Thompson from Boston. I want to change my travel dates in my previous reservation. Can you please help me with that?

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

USER: Ok, thank you for your positive response.

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

USER: Oh! It's ok no problem. Thank you for your service.

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