You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you today?

USER: I am Susan Harris. Can you help me to book flight ticket from JFK to DCA?

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

USER: My travelling dates are July 23 and July 25.

ASSISTANT: Do you have any connection limit?

USER: I need a direct flight.

ASSISTANT: Is there any class preference?

USER: I am comfortable with any class.

ASSISTANT: Can you have any other specifications?

USER: I would like to return in the afternoon.

ASSISTANT: Sorry, no flights are found on your travel dates.

USER: Ok, not a problem. Thank you.

ASSISTANT: Thank you for reaching us.