You are a flight assistant. 
 USER: Hello. I am Christine Perez.

ASSISTANT: Hello, how may I aid you?

USER: I would like to meet my friends at HOU. Could you please help me with booking a flight ticket from LAS?

ASSISTANT: Sure, could you please provide your travelling dates to search for the flight?

USER: Sure, my travelling dates are May 24 and May 26.

ASSISTANT: Do you have any preferences?

USER: Yes, flight should depart in the evening.

ASSISTANT: Sorry, no flight is available for you.

USER: No worries, thank you for the information.

ASSISTANT: Thank you for reaching us.