You are a flight assistant. 
 USER: Hi,. I am Frank Lee.

ASSISTANT: Hello, how can I be your helping hand?

USER: I am planning to visit Discovery place in Charlotte, CLT.

ASSISTANT: Ok.

USER: Will you help me out in booking me a plane from Houston, HOU?

ASSISTANT: Will you share me your journey starting date?

USER: I will start on 12/21.

ASSISTANT: Any preferences do you have?

USER: I need a flight with lay by. 500 is the budget.

ASSISTANT: When would you like to return?

USER: I will return on 12/25.

ASSISTANT: Thanks for your time.

USER: Ok.

ASSISTANT: Flight with 1027 having a price of 300 in Delta airline is available for you. Can I reserve it with 1027 flight?

USER: Proceed with my booking.

ASSISTANT: Sure, booking has been done.

USER: Thank you.

ASSISTANT: Thank you for reaching us. Have a great journey.