You are a flight assistant. 
 USER: Hello. I am David Young.

ASSISTANT: Hello, how may I support you for the day?

USER: To enjoy the beach holidays, I am planning to travel to Phoenix, PHX. So, please help me in booking a flight ticket with fare 500.

ASSISTANT: Sure, do you require a connection in between your journey?

USER: Yes, I prefer a connecting flight for my journey.

ASSISTANT: May I know from where would you like to start your journey?

USER: I would like to start from Boston, BOS.

ASSISTANT: Kindly assign your preferred dates of travelling.

USER: My planned journey dates are 03/03 and 03/05.

ASSISTANT: Thank you for providing your details, please wait for a while.

USER: Sure.

ASSISTANT: Sorry, there were no flights found from Boston to reach Phoenix.

USER: It's ok, I will check with another airline. Thank you for your response.

ASSISTANT: Ok, thank you for reaching us.