You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Kimberly Turner here.

ASSISTANT: How may I assist you?

USER: I want to meet my cousin on her birthday, so please book my ticket from DCA to AUS.

ASSISTANT: Sure, can you please provide your departure and arrival dates of your journey?

USER: My itinerary dates are Apr 13 and Apr 15.

ASSISTANT: Can you please provide your depart and arrival time preference?

USER: I want to return in the evening.

ASSISTANT: Is there any other preferences that you need?

USER: I need a connecting flight.

ASSISTANT: I have checked with you detail in our portal but no flight is available on your travel dates to reserve a seat for your journey.

USER: No problem, thank you.

ASSISTANT: You are most welcome and have a nice day.