You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I am Jerry Martin. Can you help me to book a connecting flight from ATL to DCA?

ASSISTANT: Sure, I will help you to book a flight ticket. Can you please share me your travelling dates?

USER: My travelling dates are 18 and 20 of May.

ASSISTANT: Ok, do you have any connection limit?

USER: I need a connecting flight.

ASSISTANT: Ok, do you have any specific time for your travelling?

USER: My return time should be in the afternoon.

ASSISTANT: Sorry, no flights are available on your route.

USER: It's ok, not a problem, thank you.

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