You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: I planned to meet my friend in AUS, can you please help me to book a flight ticket from DFW?

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

USER: I prefer to travel on Jul 20 and Jul 22.

ASSISTANT: Please forward your good name.

USER: I am Stephen Taylor.

ASSISTANT: Do you have any connection limit?

USER: I prefer to travel in a connecting flight.

ASSISTANT:  Is there any other preferences that you would like to add before booking?

USER: I would like to depart in evening.

ASSISTANT: Sorry, no flights are available in this route as per your requested dates.

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

ASSISTANT: Thank you for reaching us.