You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today from my end?

USER: My name is Brian Hill.

ASSISTANT: Yes, Brian.

USER: I am looking to book a flight ticket from IAD to LGA to meet my friend. can you help me for booking a flight ticket?

ASSISTANT: Sure Brian, I am here to help you out. Please provide me your trip dates.

USER: My travelling dates are 04/07 and 04/09.

ASSISTANT: Sorry Brian Hill, there is no flight in your route with your travel dates in your way.

USER: That's ok, thank you for checking.

ASSISTANT: Thank you for reaching us.

USER: Welcome.