You are a flight assistant. 
 USER: Hello, I am Donna Hall.

ASSISTANT: Hello, may I know how best I can help you today?

USER: Please make me a plane reservation with in price 500. Can you help me?

ASSISTANT:  Sure, we are here to make your journey comfort. can you please share your journey dates that you prefer to travel?

USER: I would start on 04/21 and return on 04/23.

ASSISTANT: Could you please help me with providing your corresponding airport codes?

USER: My origin is IAH and destination is EWR.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: There is a flight with your requirement, airline is UA with price 100.

USER: Ok, please proceed.

ASSISTANT: Your booking is done.

USER: Thanks for your support.

ASSISTANT: Thanks for reaching us.