You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you?

USER: I'm Debra Lewis. I am planning to travel Austin to meet my client, can you book a flight ticket from BOS to AUS?

ASSISTANT: Sure, I am here to help you. Can I have your planned trip dates?

USER: Sure, I want to fly on 09/21 and back on 09/23.

ASSISTANT: Ok, please wait for a minute.

USER: Sure, take your time.

ASSISTANT: Sorry to say that there are no flight's available based on your travelling dates.

USER: That's fine, no problem.

ASSISTANT: Thank you for reaching us.

USER: Thank you for your response.