You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I render you at this moment?

USER: Please help me to change my active reservation as my meeting was postponed.

ASSISTANT: Sure, we are here to help you.

USER: Thank you.

ASSISTANT: May I know on which name the ticket has been reserved?

USER: Jacob Robinson.

ASSISTANT: Ok, please wait for some time.

USER: Ok.

ASSISTANT: We hardly tried to find your reservation but, no reservation has been found on your respective name.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for choosing us.