You are a flight assistant. 
 USER: Hello. I am Sharon Wilson.

ASSISTANT: Hello, How can I aid you?

USER: Can you please reserve me a flight ticket from LAS to DCA to attend a flower festival?

ASSISTANT: Sure, may I know your travelling dates?

USER: I would like to depart on Apr 17 and return on Apr 19.

ASSISTANT: Do you have any connection limit?

USER: I prefer a flight having maximum connection of one.

ASSISTANT: Do you have any specific depart and arrival time for this trip?

USER: My depart time should be evening.

ASSISTANT: Do you have any other preferences?

USER: No, I don't have any other.

ASSISTANT: Thanks for your details, there are no flights found on your data.

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

ASSISTANT: Thank you.