You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I am Virginia Harris. I have planned to go long trip for enjoy myself, can you please help me to book a ticket with the fare of 200?

ASSISTANT: Sure, I will help you. May I know your travelling dates?

USER: I have planned to travel on 05/19 and 05/21.

ASSISTANT: Can you share me your airport codes?

USER: My airport codes are from AUS to OAK.

ASSISTANT: Do you have any connection limit?

USER: Yes, I need a halt.

ASSISTANT: Thanks for your details. There are no flights available under the range of 200.

USER: Ok, no problem. Thank you.

ASSISTANT: Thanks for choosing us.