You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. What can I do for you today?

USER: Katherine Scott here. I want to meet my childhood friend in Houston.Could you please help me for booking a flight ticket?

ASSISTANT: Sure, I would be happy help you, can you please provide your travelling dates?

USER: My departure date is 09/26 and return date is 09/28.

ASSISTANT: I need your airport codes, can you share to me to proceed the booking?

USER: My airport codes are from AUS to IAH. Make sure mu price limit is. Make sure my price limit is 200.

ASSISTANT: Please give me a minute, I will get back with your details.

USER: Ok.

ASSISTANT: I am sorry to say that there is no flight on your dates.

USER: Anyway, thank you for the information.

ASSISTANT: Thank you for contacting us, have a nice day.