You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you?

USER: Can you please book me a ticket with the fare of 500?

ASSISTANT: Sure, I can help you. May I know your travelling dates?

USER: My travel dates are from 11/26 to 11/28.

ASSISTANT: Please share me your airport codes.

USER: My airport codes are from AUS to ORD.

ASSISTANT: Do you need any connecting flight?

USER: I need a halt.

ASSISTANT: May I know your name?

USER: Myself Dorothy Robinson.

ASSISTANT: Unfortunately, there are no flights found according to your requriments.

USER: Ok, no problem. Thank you so much for your service.

ASSISTANT: Thank you for consulting us.