You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I assist you?

USER: Could you please book a flight ticket from MSP to SFO?

ASSISTANT: Sure, may I know the travelling dates?

USER: My trip dates are May 07 and May 09.

ASSISTANT: Do you have any connection limit?

USER: I need a connecting flight.

ASSISTANT: Is there any other requirements?

USER: I prefer an economy class.

ASSISTANT: May I know your name?

USER: My name is Sandra Moore.

ASSISTANT: Please wait a minute.

USER: Sure.

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

USER: Not a problem, thank you for the information.

ASSISTANT: Thank you for availing us.