You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you at this moment?

USER: I am David Lewis. Can you help me in booking the ticket from LGA to IAH?

ASSISTANT: Sure, I am happy to help you with that. Can I have your travel dates please?

USER: My planning dates are from 03/06 to 03/08.

ASSISTANT: Ok, pleas wait a moment and I will check for flight availability.

USER: Ok.

ASSISTANT: I have found a flight in UA airlines with connenctions 2 and price 100, is it ok for you?

USER: Sorry, I need a flight with 1 connection.

ASSISTANT: Ok, I will check with that.

USER: Ok.

ASSISTANT: Sorry David Lewis, no flight available to you on your dates with connection 1.

USER: That's fine. Anyway, thank you for your help.

ASSISTANT: Thank you for choosing us, have a great day.