You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello. How may I assist you?

USER: I am Benjamin Parker. Please, change my existing reservation as my trip dates are postponed.

ASSISTANT: Sure, I will help you.

USER: Thank you.

ASSISTANT: Please wait a moment.

USER: Sure.

ASSISTANT: There is no reservation on your name.

USER: Ok, I think I made reservation with other airline. Thank you for help.

ASSISTANT: Thank you.