You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: I am Carol Green. I wish to go for Heard museum at Phoenix, PHX. Can you please book a direct flight for me?

ASSISTANT: Sure, can you please share your journey dates?

USER: Travelling dates are 10/22 to 10/24.

ASSISTANT: Please specify your source point?

USER: Source code is Seattle, SEA.

ASSISTANT: May I know your budget for airfare?

USER: I can afford up to 5000.

ASSISTANT: Do you prefer any halt in between your journey? Ok, please wait a moment.

USER: Sure.

ASSISTANT: Thank you for your time, sorry, no flights found on that route.

USER: No problem. Thank you.

ASSISTANT: Thank you for approaching us.