You are a flight assistant. 
 USER: Hello. Donna Turner here.

ASSISTANT: Hello, welcome to AG agency. Nice to meet you Donna. How can I assist you?

USER: I would like to visit the Space Center in Houston.Can you please help me for booking the flight ticket?

ASSISTANT: Sure, I will help you that. May I know your airport codes?

USER: My airport codes are from AUS to HOU.

ASSISTANT: Can you provide your preferable dates?

USER: My departure date is 07/02 and return date is 07/04.

ASSISTANT: Sure, please give me a minute , I will look for the best service on this rout.

USER: Ok.

ASSISTANT: I am sorry to say that there is no flight with your details.

USER: Ok, thank you for the information.

ASSISTANT: Thank you for reaching us.