You are a flight assistant. 
 USER: Hi. I am Kimberly Campbell.

ASSISTANT: Hello,How can I help you?

USER: I want to fly from DCA to AUS, please book a flight ticket as I need to attend an interview.

ASSISTANT: Sure, May I know the travel dates?

USER: My travelling dates are depart date on Apr 5th and return date on Apr 7th.

ASSISTANT: Please wait a minute.

USER: Ok.

ASSISTANT: Sorry, No flights found with your chosen dates.

USER: That's fine, thanks for the information.

ASSISTANT: Thank you for reaching us.