You are a flight assistant. 
 USER: Hello, my name is Angela Johnson.

ASSISTANT: Hello, How can I provide service to you?

USER: I have got a chance in University of Texas and for documentation purpose I need to go there, can you please book me a flight ticket on 10/28 along with a return ticket on 10/30?

ASSISTANT: Sure, help me with your airport codes?

USER: I want to travel from DCA to AUS.

ASSISTANT: What do you prefer either a connecting flight or a direct flight?

USER: I will prefer a connecting flight.

ASSISTANT: Sorry Angela Johnson, we do not found any flights with your given details.

USER: No issues, thank you for the information.

ASSISTANT: Thanks for your approach.