You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

USER: Please help me to book a flight ticket from MSP to DFW.

ASSISTANT: Sure, may I know your connection limit?

USER: I need a single connecting flight.

ASSISTANT: Let me know your travelling dates.

USER: My travelling dates are from July, 21 to July, 23.

ASSISTANT: Do you have any class preference?

USER: I prefer an economy class.

ASSISTANT: Do you have any other requirements?

USER: I need to depart in the morning and I need a single connecting flight.

ASSISTANT: May I know your name please?

USER: I am Sandra Davis.

ASSISTANT: Sorry, there are no morning flights available.

USER: No problem, thanks for your information.

ASSISTANT: Thank you for opting us.