You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you?

USER: I want to book a flight ticket from MSP to IAD. Could you help me in booking?

ASSISTANT: Sure, when would you like to travel?

USER: My travelling dates are from Nov 26-28.

ASSISTANT: Do you have any airline preferences?

USER: I prefer for normal-cost airline.

ASSISTANT: May I know your name please?

USER: Dennis Collins here.

ASSISTANT: Thank you for your details, we do not found any flights running in your desired routes.

USER: That's ok, no problem. Thank you.

ASSISTANT: Thank you for reaching us.