You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I serve you?

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

ASSISTANT: Sure, may I know the travelling dates?

USER: Depart is by Feb, 7 and return date is Feb, 9.

ASSISTANT: Do you have any connection limit?

USER: I would be comfortable with single stop over.

ASSISTANT: Are there any other requirements?

USER: I prefer normal-cost airlines.

ASSISTANT: May I know your name?

USER: Joshua Brown.

ASSISTANT: Please wait a minute.

USER: Sure.

ASSISTANT: Sorry, no flights found with your preferable dates.

USER: Thank you.

ASSISTANT: Thank you for availing us.