You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I best assist you now?

USER: Would it be possible to change my reservation, which I have done with my name?

ASSISTANT: Sure, I am happy to help you to change the ticket details once I have found your ticket. Can I know your name please?

USER: Yes, my name is Stephanie Collins.

ASSISTANT: Ok, wait for some time I will check the reservation on your name and get back to you.

USER: Ok, take your time.

ASSISTANT: Thanks for remaining so positive, we are sorry to say that there is no active reservation found on your name.

USER: That's ok, thank you for the response.

ASSISTANT: Thanks for choosing us, wish you a great day.