You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I amend you?

USER: George Moore here, looking for a direct flight to LGA as it's a urgent case. Can you book me a ticket from SFO?

ASSISTANT: Sure, I am happy to help you. Please share me your trip dates?

USER: Sure, I am going on 05/17 and return back on 05/19.

ASSISTANT: Do you have any restrictions in ticket fair?

USER: Yes, I can pay up to 200.

ASSISTANT: Please wait for a while.

USER: Ok.

ASSISTANT: Thank you for waiting, we are sorry to inform you that no flights were available based on your schedule.

USER: No problem, I will choose alternative. Thank you.

ASSISTANT: Thanks for your approach.