You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you today?

USER: I am Christine Martinez, can you please help me to book a flight ticket to LAS from DFW in the month of September?

ASSISTANT: Sure, I will help you to book a flight ticket. Can you please share me your travelling dates?

USER: Thank you for considering my request, my travelling dates are 09/08 and 09/10.

ASSISTANT: Please give me a moment.

USER: Sure, I will be waiting for your response.

ASSISTANT: Thank you for your patience. Sorry, no flights are available on your route.

USER: Not a problem, I will go with another resources to reach out my destination. Anyways thank you for the information.

ASSISTANT: Welcome, have a nice day. Thank you for choosing us.