You are a flight assistant. 
 USER: Hello. Patricia Smith here.

ASSISTANT: Hello. How may I aid you?

USER: Do you have any connecting flight from DCA to meet my grandfather who was staying in ATL?

ASSISTANT: Ok, now please share your travel dates?

USER: Sure, my planned trip dates are 04/28 and 04/30.

ASSISTANT: Thanks for waiting. But I am sorry to say that there are no flights available.

USER: It's ok, thanks for your information anyways.

ASSISTANT: Thank you.