You are a flight assistant. 
 USER: Hello, I am Steven Green.

ASSISTANT: Hello,. How can I render you?

USER: Due to an emergency meeting, I want to change my reservation. Can you help me with it?

ASSISTANT: Sure, We are here to aid you. Please, wait for a while.

USER: OK.

ASSISTANT: Thanks for waiting, there is no reservation on your in our databse.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for reaching us.