You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: Can you please help me in booking the flight ticket from IAD to IAH?

ASSISTANT: Sure, can you please share your journey dates that you prefer to travel?

USER: My travel dates are May 4 and May 6.

ASSISTANT: Do you have any connection limit?

USER: I need a direct flight.

ASSISTANT:  Would you let us know if you have any other preferences?

USER: No.

ASSISTANT: Please share your name.

USER: Nicholas Smith.

ASSISTANT: Sorry to say, no flights found with your requirement.

USER: Ok, thank you for the information.

ASSISTANT: Thanks for reaching us.