You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I want to book a normal-cost airline. Could you help me in booking?

ASSISTANT: Sure, to book a ticket may I know your airport codes?

USER: My airport code are from DTW to IAD.

ASSISTANT: On which dates you are willing to depart and arrive?

USER: My travelling dates are from Dec 08-10.

ASSISTANT: Please let me know, If you have any other preferences.

USER: I need 1 connecting flight.

ASSISTANT: Can I know your good name please?

USER: Jack Wilson here.

ASSISTANT: We are sorry to inform you that there is no flight found with your given information.

USER: That's ok, no problem.

ASSISTANT: Thank you for choosing us.

USER: Thank you.