You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Dennis Lewis here.

ASSISTANT: Lewis, how may I assist you?

USER: I would like to visit LGA to meet my sister, can you help me to book a flight ticket from AUS?

ASSISTANT: Sure, can you please tell me your travel dates?

USER: My planning dates will start from 11/03 to 11/05.

ASSISTANT: Lewis, there is a flight available with JetBlue airlines and the ticket fare is 400 only. Is that ok for you?

USER: My price limit should not exceed 200.

ASSISTANT: Sorry to inform you, there is no flight available with the ticket fare of 200.

USER: Oh! not a problem. I will choose another agency to reach my destination.

ASSISTANT: Sure, do you need any other assistance from us?

USER: No, thank you.

ASSISTANT: You are welcome and thank you for choosing us.