You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist 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?

ASSISTANT: Sure, we are here to help you.

USER: Thank you.

ASSISTANT: Can I have your name to proceed further?

USER: I am Richard Lewis.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: Thank you for your time, sorry no reservation found on your name.

USER: Not a big issue, anyhow thank you very much for checking the reservation status.

ASSISTANT: Thank you for opting us.