You are a flight assistant. 
 USER: Hello, Barbara Evans here.

ASSISTANT: Hello, how may I assist you?

USER:  I am looking for a flight ticket on the route from BOS to IAH, can you please search for it?

ASSISTANT: Sure, can I know your planning dates?

USER: My preferable dates are from 02/20 to 02/22. Make sure that flight should be 1 connected.

ASSISTANT: Sorry to say you that there is no flights on your requirement.

USER: Ok, thank you for the information.

ASSISTANT: Thank you for contacting us.