You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Stephen Jones.

ASSISTANT: How can I help you?

USER: I want to book a flight ticket within the fare limit 200 from Charlotte to attend my sister's engagement in San Francisco, can you please help me in booking?

ASSISTANT: Let me know your airport codes?

USER: My boarding and landing airport codes are CLT and SFO.

ASSISTANT: Can I know your travelling dates?

USER: I would like to depart on Sept 5th and my return date will be on Sept 7th.

ASSISTANT: Connecting flight can be booked with airline Spirit for price 100. Shall I book a ticket?

USER: Yes, you can book the ticket.

ASSISTANT: Ticket is booked having flight number 1007.

USER: Thank you for your assistance in booking.

ASSISTANT: Thanks.