You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

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

ASSISTANT: May I know your travelling dates?

USER: I would like to depart on Apr 13th and return on Apr 15th.

ASSISTANT: Is there any connection limit?

USER: I need a connecting flight.

ASSISTANT: May I know your class preference?

USER: I need a business class ticket.

ASSISTANT: May I know your name?

USER: I am Patricia Nelson.

ASSISTANT: Do you have any other specifications?

USER: I have no other specifications.

ASSISTANT: Ok, please wait for a while.

USER: Sure, take your time.

ASSISTANT: Sorry, there are no flights found with your requirements.

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

ASSISTANT: Thank you for choosing us.