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

ASSISTANT: Hello, How  can I be of your assistance today?

USER: As my meeting with client has been postponed, can you please change my reservation?

ASSISTANT: Sure, we will help you in changing in your reservation. Please, stay online I will check the reservation and revert to you.

USER: Ok.

ASSISTANT: Thanks for waiting. Unfortunately, there is no reservation found on your name Thomas Moore in our database.

USER: No problem.

ASSISTANT: Thank you for opting us.

USER: Thank you.

ASSISTANT: Have blissful day!.