You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Mark Moore.

ASSISTANT: How can I help you?

USER: I am looking for a flight from BOS to AUS, can you reserve me a flight in my route please?

ASSISTANT: I will assist with the booking. May I know your travel dates to check the flights?

USER: My preferable journey dates are from 12/22 till 12/24.

ASSISTANT: Sorry, there are no flight available now.

USER: That's ok, no problem. I prefer any other source to reach my destination. Anyway thank you for your help.

ASSISTANT: Thank you for availing our agency.