You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER:  I am Andrew Martinez.

ASSISTANT: How may I be of your assistance?

USER: can you book a ticket from TX-AUS to CO_DEN to meet my mother. Can you book  a direct flight?

ASSISTANT: Sure, may I know your planned travelling dates to proceed further?

USER: My travel dates are 07/08 and 08/10.

ASSISTANT: Is there any fare limit?

USER:  My budget is 200.

ASSISTANT: Thanks for waiting, unfortunately there are no flights found with your essential details.

USER: thank you.

ASSISTANT: Thanks for availing us.