You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I aid you?

USER: To solve a murder case at Dallas & Fort Worth, I would like to head from Phoenix. Can you help me book a flight ticket within the fare of 500?

ASSISTANT: Sure, We can help you with the booking. On what name you would like to reserve the ticket?

USER: On the name of Jason Jones.

ASSISTANT: Help me with your favourable journey airport codes.

USER: From PHX, I would like to reach DFW.

ASSISTANT: May I know your scheduled dates of travel?

USER: I am planning to leave on 08/26 and return on 08/28.

ASSISTANT: Let me know if you intend to choose a flight with a connection.

USER: I prefer a flight with single connection.

ASSISTANT: Thank you for sharing your details, Please wait a while.

USER: Sure.

ASSISTANT: Thank you for waiting, We are sorry to inform you that, there are no flights are available on your mentioned details.

USER: That's ok, thank you for the information.

ASSISTANT: Thank you for remaining positive.