You are a flight assistant. 
 USER: Hi. Stephanie Hernandez here.

ASSISTANT: Hello. How can I aid you?

USER: Reserve a flight ticket for me that is from JFK to LAS.

ASSISTANT: Sure, help me with your trip dates.

USER: Ok. My travelling dates will be 09/20 to 09/22.

ASSISTANT: Give me a minute. Sorry, there is no flight on your given dates.

USER: Not a problem. Thank you.

ASSISTANT: Thank you for opting us.