You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how could I serve you?

USER: I am Donna Thomas want to visit Boston on my vacation, can you book a ticket from PHX to BOS?

ASSISTANT: Sure, I am here to help you. Please share me your complete journey details?

USER: My travelling dates will be 10/23 and 10/25.

ASSISTANT: May I know your price limit?

USER: Yes, my flight price should be within 200.

ASSISTANT: Please hold on, I will check and get back to you.

USER: Ok.

ASSISTANT: Based on your given details, there is no flight found.

USER: Ok fine, thanks for the information.

ASSISTANT: Thank you for approaching us.