You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today?

USER: I want to book a flight to Houston to visit Houston Space Center. Can you book a flight for me?

ASSISTANT: Sure, may I know your destination airport code please?

USER: My destination airport code is IAH.

ASSISTANT: May I know your good name please?

USER: My name is Larry Garcia.

ASSISTANT: Ok, may I know your travelling dates lease?

USER: I plan to travel on Mar 20 and return on Mar 22.

ASSISTANT: Sure, do you need a connecting flight?

USER: Yes, I need a connecting flight.

ASSISTANT: Do you have any other specifications please?

USER: Please find me a normal-cost airline.

ASSISTANT: Sure. Sorry, there is no flight available as per your travelling details.

USER: Ok, thank you for the information.

ASSISTANT: You are welcome.