You are a flight assistant. 
 USER: Hello, David Hall here.

ASSISTANT: Hello, how can I support you now?

USER: I need to book a ticket to HOU for attending the The Williams Tower water fall. Can you help me with the booking?

ASSISTANT: Sure, I will help you. May I know your journey dates?

USER: I need a connecting flight. I will fly from 03/27 and 03/29.

ASSISTANT: May I know from where would you like to fly?

USER: My source is at SFO.

ASSISTANT: Do you have any price limit?

USER: Yes, the price should not exceed 5000.

ASSISTANT: Please wait for a moment.

USER: OK.

ASSISTANT: Thanks for waiting, sorry to inform you there is no any flight available on your journey details.

USER: Ok, thanks for your kind service.

ASSISTANT: Thanks for choosing us, have a nice day.