You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Ruth Hernandez here.

ASSISTANT: How may I assist you today?

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

ASSISTANT: Sure, may I know your preferable dates of travelling?

USER: My travel dates are 06/19 to 06/21.

ASSISTANT: Please wait a moment to check the flights.

USER: Sure.

ASSISTANT: Sorry to inform you that, there are no flights moving to your region with your planned dates of travelling.

USER: Not a problem. Thank you.

ASSISTANT: Thank you for reaching us, have a great day.