You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, do you need any help from us?

USER: Yes, Can you help me to reserve a flight ticket.

ASSISTANT: Sure, I will help you. Can you please tell me your airport codes?

USER: My respective air code are from CA- SFO to TX-AUs.

ASSISTANT: Sure, may I know on what dates you need booking?

USER: I need to travel  from 12/10 to 12/12. My name is Michelle Carter.

ASSISTANT: The UA airline with flight number 1017 is available having fare as 100 and connection as 1. Fine, your reservation is confirmed.

USER: I want a direct flight, can you please check it once.

ASSISTANT: Sorry, there is no flight on your request.Thank you for choosing us.

USER: Thank you for your service.