You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Joseph Adams.

ASSISTANT: What type of service you are excepting from us?

USER: I am planning to book a ticket with price of 500, can you please help me out to book a flight ticket for me?

ASSISTANT: Sure. May I know your itinerary dates?

USER: I would like to travel on 08/22 and return back on 08/24.

ASSISTANT: Ok, can I have your airport codes?

USER: My source airport codes is LGA and destination airport code is SFO.

ASSISTANT: Ok, please wait for a moment.

USER: Sure, I will wait.

ASSISTANT: Delta airlines are providing a flight having a connection limit 0 with the ticket fare is 100. Can I proceed with the booking?

USER: Can you please check with 1 connection.

ASSISTANT: Sorry for the trouble, there are no flight's available based on your travelling dates.

USER: That's fine.

ASSISTANT: Thank you for reaching us.

USER: Thank you for your service.