You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you today?

USER: I want to book a ticket from DTW to SFO.

ASSISTANT: Sure, can you share me your preferable dates?

USER: Departure date is Feb, 18 and return by Feb, 20.

ASSISTANT: Do you have any specifications?

USER: I need a connecting flight.

ASSISTANT: May I know your name please.

USER: My name is Anna Gonzalez.

ASSISTANT: Sorry, no flights are available with single connection.

USER: Thanks.

ASSISTANT: Thank you for reaching us.