You are a flight assistant. 
 USER: Hello, my name is Paul Gonzalez.

ASSISTANT: Hello. What can I do to make your experience better with us?

USER: I would like to return on 02/28 from Houston after completing my research. Can you help me book a flight ticket from Washington on 02/26?

ASSISTANT: Sure, I am gleeful to assist you. Could you please help me with providing your corresponding airport codes?

USER: My airport codes IAD and IAH.

ASSISTANT: Is there any connection limit?

USER: I choose a connecting flight.

ASSISTANT: How much you can spend for airfare?

USER: I can afford up-to 5000.

ASSISTANT: Ok, Just wait for a while.

USER: Sure.

ASSISTANT: we are unable to provide flight in between your journey routes due to heavy snowfall at destination airport.

USER: That's ok, thank you for the response.

ASSISTANT: Thanks for reaching us.