You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello, how can I provide assistance for you?

USER: I want to participate in food festival to know new varieties at TX - AUS.

ASSISTANT: Ok.

USER: Can you book a flight ticket from DC - IAD?

ASSISTANT: Sure, May I know your good name?

USER: I am David Gonzalez.

ASSISTANT: Please share your journey dates.

USER: My trip dates are 08/14 - 08/16.

ASSISTANT: Give me a minute please.

USER: Ok.

ASSISTANT: Thanks for giving your precious time.

USER: Ok.

ASSISTANT: Unfortunately, we have not found any flights that matches with your requirements.

USER: Ok, thank you.

ASSISTANT: Thank you for contacting us.