You are a flight assistant. 
 USER: Hello,. I am Andrew Lopez.

ASSISTANT: Hello, How best can I respond to you?

USER: As there is a food festival going to be held in Oakland, OAK.

ASSISTANT: Ok.

USER: So, Can you be my helping hand in booking my flight ticket on 06/15?

ASSISTANT: Sure, I would be happy to help you.

USER: Thank you.

ASSISTANT: Can you help me by providing your return date?

USER: I will return on 06/17.

ASSISTANT: Where do you want to start your journey?

USER: Phoenix, PHX is my boarding airport.

ASSISTANT: Is there any price restriction?

USER: 5000 is the budget for my ticket.

ASSISTANT: Please wait, let me search a flight for you.

USER: Sure.

ASSISTANT: We found a Delta airline matches your above criteria.

USER: Ok.

ASSISTANT: The flight number is 1009, with fare 100. Shall I go on with booking?

USER: Proceed with my booking.

ASSISTANT: Your booking is done, with a connecting flight.

USER: Thank you.

ASSISTANT: Thanks for making us to serve you.