You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you today?

USER: I need you to re-book my flight ticket. Please help me.

ASSISTANT: Ok, please may I know your name?

USER: My name is Nicholas Miller.

ASSISTANT: Ok, please wait a moment.

USER: Sure, I will wait.

ASSISTANT: Ok, thank you for waiting. Sorry as per your request there is no reservation been found in our records.

USER: That's ok. Thanks for your time.

ASSISTANT: Thank you for choosing our agency.