You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am John Miller.

ASSISTANT: How may I aid you?

USER: Can you help me in booking a ticket from LAX to SFO?

ASSISTANT: Sure, please mention your trip dates to go.

USER: My planning dates are from 05/27 to 05/29.

ASSISTANT: Ok, according to your information there is a flight-1022 on Frontier airline with connection 1 and price 800. Shall I book it?

USER: I need a flight with 200 as my budget is very low.

ASSISTANT: Ok, let me check.

USER: Ok.

ASSISTANT: Sorry, there is no flight for you with your preferences.

USER: It's fine. Anyway, thank you for your help.

ASSISTANT: Ok, thanks for choosing us.