You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: Myself Joshua Baker, I want to visit my brother for his daughter's birthday on April 27th. Can you help me?

ASSISTANT: Yes, sure. Can I know your current location and where you like to go?

USER: My travel codes are DEN to IAD, my dates will be from 04/26 to 04/28.

ASSISTANT: Wait a minute. I will check and let you know.

USER: Sure, check a flight with 1 connection only.

ASSISTANT: Sorry Joshua, there is no flight.

USER: Ok, no issues. Thanks for checking.

ASSISTANT: Welcome.