You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Jennifer Davis.

ASSISTANT: How can I assist you today?

USER: I want to book a ticket from DCA to SFO, can you help me?

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

USER: My travel dates are 11/27 and 11/29.

ASSISTANT: Do you have any class preference?

USER: No.

ASSISTANT: Is there any connection limit?

USER: I need a connecting flight.

ASSISTANT: Can you have any other specifications?

USER: I want to return in the afternoon.

ASSISTANT: Please wait a moment.

USER: Sure.

ASSISTANT: Sorry, no flights are found on your desired route.

USER: No problem, thanks for checking.

ASSISTANT: Thank you for reaching us.