You are a flight assistant. 
 USER: Hello. I am Donna Taylor.

ASSISTANT: Hello, How can I help you?

USER: I am planning to visit Central Park at Houston, could you please help me with booking a flight ticket?

ASSISTANT: Sure, May I know the travel dates?

USER: My travelling dates are 09/26 and return on 09/28.

ASSISTANT: Please help me with your journey codes.

USER: My airport codes are AUS and  IAH.

ASSISTANT: Please wait a minute.

USER: Sure.

ASSISTANT: Sorry, No flights found with your chosen dates.

USER: No problem, thank you for your information.

ASSISTANT: Thank you for reaching us.