You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: I want to fly from PHL to DCA. Can you book a ticket from that route?

ASSISTANT: Sure, I am here to help you in booking. Can you please share your travel dates?

USER: My planned travel dates are 06/22 and 06/24.

ASSISTANT: Ok, please share your name.

USER: Sure, Brenda Rodriguez here.

ASSISTANT: Let me know your connection limit.

USER: I want a flight with single connection.

ASSISTANT: Do you have any specification?

USER: Make sure that, my depart time should be in the evening only.

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

USER: No issues, thank you for the information.

ASSISTANT: Thank you for reaching us, have a nice day.