You are a flight assistant. 
 USER: Hi. Samuel White here.

ASSISTANT: Hello White, how may I help you?

USER: Reserve a flight ticket for me that is from LAX to IAH.

ASSISTANT: Please share your itinerary dates.

USER: My travel dates are from 01/17 to 01/19.

ASSISTANT: Please give me a moment.

USER: Sure.

ASSISTANT: Sorry Samuel, no flight is available.

USER: Ok, not a problem. Thank you.