You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I aid you?

USER: Can you please help me with booking a flight ticket from DEN to IAD?

ASSISTANT: Sure, can you please let me know your trip dates?

USER: My travel dates are July 28 and 30.

ASSISTANT: Would you like to fly with connecting flight or direct flight?

USER: I need a connecting flight.

ASSISTANT: Are you looking to fly with economy class flight or business class flight?

USER: I am comfortable with any class.

ASSISTANT: Do you have any other specifications?

USER: No.

ASSISTANT: Could you help me with your name please?

USER: My name is Kathleen Green.

ASSISTANT: Please allow me 2-3 minutes while I check for the flights availability.

USER: Ok.

ASSISTANT: Thank you for waiting, Kathleen Green. Sorry, there is no flight availability for the given dates.

USER: Ok, no issues. Thank you.

ASSISTANT: Thank you for reaching us.