You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I want to book a flight ticket from AUS to EWR, can you please help me with this?

ASSISTANT: May I know your airline preferences?

USER: I would like to prefer normal cost airline.

ASSISTANT: Sure, may I know your travelling dates?

USER: My journey dates are Aug 18 to Aug 20.

ASSISTANT: Do you have any time concern?

USER: No.

ASSISTANT: May I know your name?

USER: My name is Samantha Campbell.

ASSISTANT: Sorry to say, no flight is available for you.

USER: No problem, thanks for your information.

ASSISTANT: Thank you for reaching us.