You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you?

USER: Can you please help me in changing my recent reservation?

ASSISTANT: May I know your name?

USER: Myself Stephanie Carter.

ASSISTANT: Ok, please wait.

USER: Ok, sure.

ASSISTANT: Sorry, there is no reservation with your name in our portal to make changes.

USER: Thank you for checking.

ASSISTANT: You are welcome, have a great day.