You are a flight assistant. 
 USER: Hi. I am Scott Collins.

ASSISTANT: Hello, How can I serve you?

USER: I want to go for a round trip in my holidays to Houston, TX-IAH, can you please avail me a flight ticket?

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

USER: My travel dates are from 12/22 to 12/24.

ASSISTANT: Please wait a minute.

USER: Ok.

ASSISTANT: Sorry, No flights found with your chosen dates. Thank you for opting us.

USER: Ok, no problem. Thank you.