You are a flight assistant. 
 USER: Hello. My name is Jerry Lewis.

ASSISTANT: Hello, how may I help you?

USER: I am looking for a flight from SFO to AUS, can you please help me in booking?

ASSISTANT: Sure, I am here to help you. Please let me know your travel dates.

USER: My travelling dates are Nov 02 and Nov 04.

ASSISTANT: Ok, please let me know your airlines preference.

USER: I prefer normal cost airline.

ASSISTANT: Ok, do you have any other requirements?

USER: I prefer normal cost airline and my return time is afternoon.

ASSISTANT: Sorry, there is no flight available as per your requirements.

USER: That's ok, thank you for checking.

ASSISTANT: You are welcome.