You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: Steven Green here. I want to meet my cousin on his birthday, so please book my ticket from BOS to SFO.

ASSISTANT: Sure, may I know your planned travel dates?

USER: My trip dates are Sept 18 and Sept 20.

ASSISTANT: Do you need a halt in between your journey?

USER: I need 1 halt.

ASSISTANT: Do you have any airline preference?

USER: No.

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: We found an airline: Frontier, flight number: 1010 and price is 300 with one connection.

USER: I can afford 200 for my ticket.

ASSISTANT: Sorry to say that, no flights were found with your given fare.

USER: No problem, thank you.

ASSISTANT: Thank you for reaching us.