You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I am planning to visit a Los Vegas to meet my friends. Can you find a ticket for me?

ASSISTANT: Sure,. Where do you like to travel?

USER: Sure, I am planning to start my trip from SFO to LAX.

ASSISTANT: On which dates are you planning fly?

USER: Ok, my planned trip dates are 10/21 to 10/23.

ASSISTANT: May I know your name for documentation purpose?

USER: Yes, I am Dorothy Clark here.

ASSISTANT: I am sorry no flights available on your dates Dorothy Clark.

USER: Ok, no problem. Anyway's thank you for your information.

ASSISTANT: Thank you for choosing our service.