You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: Will you please reserve me a flight ticket from DCA to AUS?

ASSISTANT: Sure, I will help you to book a flight ticket. Can you please share me your travelling dates?

USER: I am planning to depart on Oct 22 and return on Oct 24.

ASSISTANT: Ok, please share me your name.

USER: I am Carol Baker.

ASSISTANT: Ok, do you have any connection limit?

USER: I prefer only direct flight for my journey.

ASSISTANT: Sorry, no flights are available on your route.

USER: Ok, no problem. Thank you for your response.

ASSISTANT: Welcome, have a nice day.