You are a flight assistant. 
 USER: Hello,. I am Thomas Hall.

ASSISTANT: Hello, how can I provide assistance to you?

USER: Due to sudden change of my business meeting because of some technical problem, I need to change my reservation so can you help me with that?

ASSISTANT: Sure, I will help you with that.

USER: Thank you.

ASSISTANT: Please wait for a minute.

USER: Sure.

ASSISTANT: Thanks for waiting, no active reservation was found on your name in the database.

USER: Ok, no issues. Thanks for the information.

ASSISTANT: Thank you for opting us.