You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: I heard that red rock canyon national conventional area is the best place to visit in the month of April which is located in Las Vegas. Can you avail me to book a flight from Washington, DCA?

ASSISTANT: Sure, I am here to aid you. May I know your journey dates please?

USER: My journey dates are Apr 19 and 21.

ASSISTANT: Ok, please mention your destination airport code.

USER: My destination airport code is Las Vegas, LAS.

ASSISTANT: Is there any class preference?

USER: No.

ASSISTANT: In which airline, you prefer to go?

USER: I need a normal cost airline.

ASSISTANT: Do you have any other specifications?

USER: I need a connecting flight.

ASSISTANT: To proceed further, we need your name.

USER: Sure, please reserve the seat under the name of Frank Walker.

ASSISTANT: Thanks for your name, please wait.

USER: Sure.

ASSISTANT: Thank you for waiting, no flights were found based on your schedule.

USER: Ok, thanks for the information.

ASSISTANT: Thank you for choosing us.