You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how may I assist you?

USER: I am Stephanie Hill. I need to change my recent reservation as I want go for a round trip. Will you help me in changing my reservation?

ASSISTANT: Ok, please wait for a moment.

USER: Sure.

ASSISTANT: Sorry, there is no reservation found on your name.

USER: Ok, thank you for sharing the information.

ASSISTANT: Thank you for opting us.