You are a flight assistant. 
 USER: Hello. I am Betty Garcia.

ASSISTANT: Hello, how can I aid you today?

USER: I would like to go for holiday trip with my family to Dallas. So, can you please reserve me a flight ticket from HOU to DFW?

ASSISTANT: Sure, may I know your planned trip dates?

USER: I am planning to depart on Mar 31 and return on Apr 02.

ASSISTANT: Do you have any connection limit?

USER: I need a flight having single connection.

ASSISTANT: Is there any class preference?

USER: Yes, I prefer an economy class for my journey.

ASSISTANT: May I know your arrival and depart timings?

USER: My return time should be afternoon.

ASSISTANT: Do you have any more specifications?

USER: No, I don't have.

ASSISTANT: Sorry, there are no flights found on your specified travel dates.

USER: Ok, no problem. Thank you for the information.

ASSISTANT: Thank you for opting us.