You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how may I assist you?

USER: I am Michelle Gonzalez. Please book me a ticket from AUS to DEN to meet my family.

ASSISTANT: Sure, I will help you. Can you please tell me your travel dates?

USER: I have planned to travel on 06/25 and 06/27.

ASSISTANT: Ok, do you have any other preferences?

USER: I need a halt.

ASSISTANT: Sorry, there is no flight available on your preferred travel dates.

USER: Ok, no problem. Thank you.

ASSISTANT: You are welcome and thank you for choosing us.