You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I aid you today?

USER: I want to book a ticket from HOU to DCA. Could you book a ticket?

ASSISTANT: Sure, we are here to help you. Can you share me your travelling dates to book a flight ticket?

USER: Travelling dates are Nov,1 and Nov, 3.

ASSISTANT: May i know your name?

USER: My name is Elizabeth Miller.

ASSISTANT: Do you have any other specifications?

USER: I prefer to fly in a normal-cost airline.

ASSISTANT: Ok, wait for some time.

USER: Sure.

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

USER: Thank you.

ASSISTANT: Thanks for approaching us.