You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Jacob Hill here.

ASSISTANT: How may I help you today?

USER: Can you please help me in booking the ticket from Houston to Dallas?

ASSISTANT: Sure, I am happy to help you. Could you provide me your travelling dates?

USER: Sure, my journey dates are 08/09 and 08/11.

ASSISTANT: Ok, can I have your airport codes?

USER: My airport codes are HOU and DFW.

ASSISTANT: Sorry to say that, there is no flight's available based on your travelling dates.

USER: That's ok, thank you for giving the information.

ASSISTANT: Thank you for reaching us.