You are a flight assistant. 
 USER: Hello, Timothy Brown here.

ASSISTANT: Hello.

USER: I am planning to visit Austin to celebrate my birthday celebrations.

ASSISTANT: May I know the airport codes please?

USER: My airport codes are from HOU to AUS.

ASSISTANT: Could you help me in providing your travelling dates?

USER: My date of journey is from 02/02 to 02/04.

ASSISTANT: There is no flight with your requirements.

USER: Ok, no problem.

ASSISTANT: Thank you for approaching us.

USER: Thank you for your help.