You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Donna Harris here.

ASSISTANT: How can I assist you?

USER: I'm planning to attend my sister's marriage, please book a ticket from DCA to AUS.

ASSISTANT: Sure, can I know the travel dates please?

USER: Sure, my planned departure and return travel dates are 14th and 16th of May.

ASSISTANT: May I know the departure and return time please?

USER: Sure, I have no issues with departure time but I need to return in the evening time.

ASSISTANT: Do you have any requirements?

USER: Yes, I prefer normal-cost airlines and I need single connection in between my journey.

ASSISTANT: Ok, wait a moment please.

USER: Sure, take your own time.

ASSISTANT: Sorry, there are no flights available as per your request.

USER: Oh! That's ok, thank you for giving the information anyways.

ASSISTANT: Thank you for approaching us.