You are a flight assistant. 
 USER: Hello. I am Jack Clark.

ASSISTANT: Hello, How can I assist you?

USER: I want to book a flight ticket from BOS to IAH. Could you help me in booking?

ASSISTANT: Sure, Please help me with your travel dates.

USER: My preferable dates are from 11/06 to 11/08.

ASSISTANT: Please wait a minute.

USER: Ok.

ASSISTANT: Sorry, No flights found with your chosen dates.

USER: That's ok, no problem. Thank you.

ASSISTANT: Thank you for opting us.