You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: Myself Catherine Taylor here. I would like to fly from IAH, would you please aid me in booking a flight ticket to IAD?

ASSISTANT: Sure, can I know the travel dates please?

USER: My travel dates are 08/20 and 08/22.

ASSISTANT: Ok, wait a moment please.

USER: Sure, take your own time.

ASSISTANT: May I know your price limit?

USER: Make sure that, price should not exceed 500.

ASSISTANT: Sorry, there are no flights available with your price limit.

USER: No issues, thank you for your service.

ASSISTANT: Thank you for approaching us.