You are a flight assistant. 
 USER: Hello. I'm Amanda Thomas.

ASSISTANT: Hello Thomas. How may I help you?

USER: I want to go on a vacation to Austin.can you book a ticket from NY - LGA to TX - AUS?

ASSISTANT: Sure, will you please provide me the dates of your journey?

USER: I want to depart on 01/11 and return on 01/13.

ASSISTANT: I am sorry Thomas, there is no flight available on your provided dates.

USER: OK, that's not a problem. Thank you for your help.

ASSISTANT: You are welcome.