You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how best may I serve you today?

USER: Please book me a flight ticket from ORD to AUS to  meet my family.

ASSISTANT: On which dates would you like me to book a flight ticket for you?

USER: I have planned to travel on Apr 11th and return on Apr 13th.

ASSISTANT: Do you like to go with a connecting or direct flight?

USER: I like to connecting flight.

ASSISTANT: May I know your name?

USER: Scott Clark.

ASSISTANT: Is there any other specifications regarding for journey?

USER: I want to depart at afternoon time.

ASSISTANT: Any class preference do you have?

USER: I am ok with any class.

ASSISTANT: Sorry Scott Clark, we haven't found any flights based on your specifications.

USER: Ok, no problem. Thank you.

ASSISTANT: Thanks for reaching us.