You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you today?

USER: I need to go to IAD from AUS, can you please book a flight ticket for me?

ASSISTANT: Can you share your trip dates?

USER: My travel dates are Jan 20th to Jan 22nd.

ASSISTANT: Do you prefer a normal airline or a low cost airline?

USER: I prefer normal cost airline.

ASSISTANT: Do you need a break with in your journey?

USER: I need a single break in my journey.

ASSISTANT: Can I know your good name?

USER: Jack Jones here.

ASSISTANT: Do you have any other specifications?

USER: No.

ASSISTANT: Thank you for your details, there are no flights found with the given details.

USER: That's ok, thanks for checking.

ASSISTANT: Thank you.