You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: I am Laura Green. I want to travel from DCA to SFO. Can you book a flight ticket for me?

ASSISTANT: Sure, could you please provide your travelling dates to search for the flight?

USER: I want to fly in the flight on 04/06 and 04/08.

ASSISTANT: Just hold on a moment, I will check flight availability in this route.

USER: Ok, take your own time.

ASSISTANT: Sorry to say, no flights were found on your route.

USER: That's ok. Anyways, thank you for your help.

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