You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: My name is Joshua Clark. I am looking for a flight ticket from DCA to AUS, can you please help?

ASSISTANT: Sure, may I know your trip dates?

USER: I will travel on Nov 16th and 18th.

ASSISTANT: Do you have any class preference?

USER: I am fine with any class.

ASSISTANT: Sorry Joshua Clark, there is no flights available on these dates.

USER: No problem, thank you for the information.

ASSISTANT: Most welcome.