You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Helen Williams.

ASSISTANT: How can I help you?

USER: Can you please book a flight ticket from AUS to LGA?

ASSISTANT: Sure, please share your travelling dates.

USER: Sure, I need to travel on dates of 07/05 and 07/07.

ASSISTANT: Ok, please share your fare limit for this ticket.

USER: Sure, my affordable price is 200.

ASSISTANT: Wait a minute please.

USER: Sure, take your time.

ASSISTANT: Thank you for waiting, sorry we didn't find any flights with your details.

USER: Oh! It is sad to hear. Anyway, thank you for your time.

ASSISTANT: Thank you for opting us, have a nice day.