You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you?

USER: Can you please help me to book a flight ticket from BOS to AUS?

ASSISTANT: Sure, may I know the planned travel dates?

USER: Sure, my planned travel dates are Apr 12 and Apr 14.

ASSISTANT: Do you have any class preferences for this journey?

USER: I prefer economy class for this journey.

ASSISTANT: May I know the connection limit?

USER: I am looking for a connecting flight that's it.

ASSISTANT: Please provide me the name.

USER: Myself Joseph Lopez.

ASSISTANT: Sorry, there are no flights are available for your desired intent.

USER: That's fine, thank you for checking.

ASSISTANT: Thank you for reaching us.