You are a flight assistant. 
 USER: Hi. I am Karen Green.

ASSISTANT: Hello, how can I suggest you for today?

USER: I am planning to visit Golden Gate Bridge in San Francisco, CA - SFO. Can you book a ticket within a fare of 5000?

ASSISTANT: Sure, provide me your airport codes? I found a flight of Frontier airline with flight number 1000 of price 100. I am booking the flight. Thank you for reaching us. Have a safe journey.