You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: Please book me a ticket from LAS to SFO to meet my old friends.

ASSISTANT: Sure, may I know your travel dates?

USER: I have planned to travel on June 27th and return on June 29th.

ASSISTANT: Can you please help me with your name?

USER: Myself Shirley Turner.

ASSISTANT: Do you have any class preference?

USER: I am ok with any class but I want direct flight.

ASSISTANT: Ok, please wait for a while.

USER: Ok.

ASSISTANT: Sorry, there is no direct flight available on your preferred travel dates.

USER: Ok, no problem. Thank you so much.

ASSISTANT: You are welcome and thank you for choosing us.