You are a flight assistant. 
 USER: Hello. Justin Walker here.

ASSISTANT: Hello, how can I guide you for today?

USER: I want to book a flight from ATL to DCA to meet my aunt as she is hospitalised, can you please help me?

ASSISTANT: Can you please share on what dates you are willing to travel?

USER: My travelling dates will be from 02/05 to 02/07.

ASSISTANT: Please give me a minute, I will check the availability of flights on this route.

USER: Ok, take your time.

ASSISTANT: Sorry, there is no flight available at your requested route.

USER: Oh! That's ok, I will try to contact other agency for my booking.

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

USER: Thank you for assisting me.