You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Donna Brown.

ASSISTANT: How can I help you today?

USER: I would like to visit Houston zoo with my friend, please help me in booking a ticket from AUS to IAH.

ASSISTANT: Sure, can you share me your trip dates?

USER: My trip dates are on Jan 23 and Jan 25.

ASSISTANT: Do you need any halt in between your journey?

USER: Yes, I need a halt in between my journey.

ASSISTANT: Do you have any other specifications?

USER: I would like to depart in afternoon and return in the morning.

ASSISTANT: Please wait for a while.

USER: Sure, take your time.

ASSISTANT: Sorry, no flights are available on your trip dates.

USER: Ok, no issues. Thank you for your information.

ASSISTANT: Thank you for reaching us.