You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: George Parker here. I want to travel from SFO to LAS. Can you help me in ticket booking?

ASSISTANT: Sure, could you please tell me your trip dates to proceed?

USER: My trip dates are from 02/24 to 02/26.

ASSISTANT: Sorry Parker, there are no flights on your preferred route.

USER: It's ok. Anyway, thank you for your time.

ASSISTANT: You are most welcome.