You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you out?

USER: I am planning to attend a Houston HOU from New York LGA. Can you find a flight ticket for me?

ASSISTANT: Sure, I will help you in booking the ticket. May I know your travelling dates please?

USER: Ok, my planned trip dates are on May 23 and return on May 25.

ASSISTANT: Can I know your name please?

USER: Ok, my name is William Thomas.

ASSISTANT: Do you need any specifications?

USER: Yes, I need a single connecting flight.

ASSISTANT: Sorry, there are no flights found in our database.

USER: Ok, not an problem. Thank you for your information.

ASSISTANT: Thank you for reaching us.