You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

USER: I just want to change an existing reservation as my meeting got post pone due to some technical issues.Can you help me?

ASSISTANT: Sure, I am here to help you. May I know your name?

USER: Alexander Jackson here.

ASSISTANT: Ok, please wait for a while.

USER: Ok.

ASSISTANT: Thank you for your time, we did not find any reservation on your name to change it.

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

ASSISTANT: Thank you for reaching us.