You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I aid you?

USER: I want to book a ticket from IAD to LGA. Could you book a ticket?

ASSISTANT: Sure, let me know your travel dates please?

USER: Travel dates are from Mar, 25 to Mar, 27.

ASSISTANT: May I know your connection limit?

USER: I would be comfortable with single stop over.

ASSISTANT: Do you need any other preference?

USER: I would like to prefer economy class.

ASSISTANT: Can I know your name please to proceed further?

USER: My name is Jason Walker.

ASSISTANT: Sorry to inform you that there are no flight services available on your given dates.

USER: Thank you.

ASSISTANT: Thanks for contacting us.