You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you today?

USER: Can you help me to change my recent reservation because my trip dates are postponed, can you help me?

ASSISTANT: Sure, may I know your name please?

USER: I am David Brown.

ASSISTANT: Please stay on hold for a while.

USER: Sure, take your own time.

ASSISTANT: We have not found any reservation on your name to change.

USER: That's ok, thank you for checking.

ASSISTANT: Thank you for connecting us.