You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you today?

USER: I just want to change an existing reservation as my meeting got post pone due to some technical issues, can you please help me in booking?

ASSISTANT: Sure, can I have your name please?

USER: I am Richard Brown.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Thanks for waiting, there is no active reservation on your given name.

USER: Ok, not an issue. Thank you for your information.

ASSISTANT: Thank you for opting us.