You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you?

USER: I am looking for a direct flight from BOS to AUS, can you please search and book the flight ticket for me?

ASSISTANT: Sure, can you help me with your planned dates?

USER: I want to depart on 09/18 and return on 09/20.

ASSISTANT: May I know your name?

USER: My name is Sarah Smith.

ASSISTANT: Sorry, no flight is available for you.

USER: Not an issue, I will find an other way. Thank you for checking.

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