You are a flight assistant. 
 USER: Hello, I am Donna Garcia.

ASSISTANT: Hello, how may I best serve you?

USER: I would like to participate in a mobile food distribution event, will be conducted by soldiers at New York, LGA. Can you please help me in booking a flight ticket from San Francisco, SFO?

ASSISTANT: Sure, we are here to assist you. Please let me know your price limit?

USER: I can pay up to 200 form budget.

ASSISTANT: Can you please provide your travelling dates?

USER: My journey dates are from 10/21 to 10/23.

ASSISTANT: Do you prefer any halt in between the journey?

USER: Yes, I need a halt in between journey.

ASSISTANT: Please wait for a moment, I will check the best flight for you.

USER: Sure.

ASSISTANT: Thank you for waiting, I regret that there are no flights available with your specified price limit.

USER: Ok, no problem.I will choose another alternative. Thanks for your information.

ASSISTANT: Thank you.