You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: I am planning to visit a Lady Bird Lake in Austin, so please book a flight ticket from IAD to AUS.

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

USER: I want to fly on June 26, return on June 28.

ASSISTANT: May I know your name please?

USER: My name is Matthew Adams.

ASSISTANT: Do you have any requirements?

USER: My depart time should be evening.

ASSISTANT: Ok, wait a moment please.

USER: Sure, I need a connecting flight.

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

USER: Not an issue, thank you.

ASSISTANT: Thank you for approaching us.