You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: Myself Stephanie Carter.

ASSISTANT: Nice meeting you Stephanie Carter.

USER: Due to some problems, I want to change my existing reservation.

ASSISTANT: Sure, I am here to help you Stephanie. Please wait a moment to check it.

USER: Ok.

ASSISTANT: Sorry Stephanie, there is no reservation found on you requested name in our data.

USER: Ok, thank you for your help.

ASSISTANT: Ok, thanks for contacting us Stephanie. Have a good day.