You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: My name is Stephanie Lewis.

ASSISTANT: Nice to meet you, Lewis.

USER: I need some changes in my previous reservation due to business meeting in my office on that dates, can you please change it?

ASSISTANT: Sure, please wait for a moment to check for the availability.

USER: Ok, take your time.

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

USER: It's alright, anyways thank you for quick response in searching and providing the information.

ASSISTANT: You are welcome.