You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: I am planning to visit Downtown Aquarium at Houston, could you please help me with booking a flight ticket from DCA to HOU?

ASSISTANT: Sure, I am here to help you with that.May I know your planned travelling dates please?

USER: I would like to depart on July 28th and return on July 30th.

ASSISTANT: For further proceeding, may I know your good name please?

USER: I am Gary Miller.

ASSISTANT: May I know your connection limit please?

USER: I am looking for a connecting flight.

ASSISTANT: If you have any specifications please let me know, I'll check availability according to that?

USER: I have no other specifications.

ASSISTANT: Hawaiian airline is providing couple of connection of fare 400 with economy class, shall I proceed for booking?

USER: Yes, please confirm the booking.

ASSISTANT: Sorry to inform you that, there is no flight found as per your requirement.

USER: Ok, not an issue. Anyways, thank you for the information.

ASSISTANT: Thank you for reaching us.