You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today from my end?

USER: I am William Allen. Can you please book a flight ticket from AUS to LGA?

ASSISTANT: Sure, I am here to help you out. Please provide me your trip dates.

USER: Thank you. I have planned my travel dates as Sept 03 and Sept 05.

ASSISTANT: Do you have any specifications?

USER: Yes, I would like to return in afternoon time so please check for that.

ASSISTANT: May I know your connection limit?

USER:  I am looking for single connecting flight.

ASSISTANT: Is there any other requirement to be met?

USER: No, I am ok with any airlines.

ASSISTANT: Sorry William Allen, there is no flight in your route as per your requirement.

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

ASSISTANT: Thank you for reaching us.