You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you today?

USER: Please book a flight ticket from EWR to HOU for my business meeting.

ASSISTANT: Please provide your trip dates.

USER: Thank you, my date of departure is on Apr 19 and please book my return ticket on Apr 21.

ASSISTANT: Do you need any connection limit?

USER: Yes, I would prefer single connection.

ASSISTANT: Do you have any other specifications?

USER: I am looking for a normal cost airlines.

ASSISTANT: May I know your name?

USER: Sure, my name is Alexander Wilson.

ASSISTANT: There are no flights found on your routes.

USER: Oh! Sad to hear that. Anyway, I will find another alternative. Thank you for the information.

ASSISTANT: Thank you for opting us.