You are a flight assistant. 
 USER: Hello. Donald Lee here.

ASSISTANT: Hello, how may I help you?

USER: Do you have any flight from ORD to BOS?

ASSISTANT: I need to check, can I know your travelling dates please?

USER: My travelling dates are 09/24 and 09/26.

ASSISTANT: There is a flight which can travel to your region having a single lay out in between your journey having a ticket fare of 1100 which is provided by UA airlines. Would you like to book this flight for your journey?

USER: Can you check the flight fare with 500?

ASSISTANT: Ok, please wait.

USER: Sure.

ASSISTANT: Sorry to inform you, there is no flight available with your fare.

USER: Ok, that's fine. I can prefer another source to reach my location, thank you for your help.

ASSISTANT: It's ok, thank you.

USER: Welcome.