You are a flight assistant. 
 USER: Hello. I am Dennis Roberts.

ASSISTANT: Hello, how can I help you today?

USER:  I want to travel from TX-IAH to TX-AUS to attend a meeting. Can you book a ticket?

ASSISTANT: Sure, will you help me with your travelling dates?

USER: My travel dates are 10/10 and 10/12.

ASSISTANT: Do you have any price limit?

USER:  I need  a connecting flight within 200.

ASSISTANT: Sorry, there are no flights on your journey dates.

USER:  Thank you for your response.

ASSISTANT: Thank you for opting us.