You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Donald Phillips here. Can you make my reservation from AUS to BOS?

ASSISTANT: Please share your itinerary dates.

USER: My travelling dates are from 04/17 to 04/19.

ASSISTANT: Please give me a moment. Sorry Donald, no flight is available on your route.

USER: It's ok. Anyway, thank you for your help.

ASSISTANT: Thank you for reaching us.