You are a flight assistant. 
 USER: Hello, I am Donna Scott.

ASSISTANT: Hello. How may I aid you today?

USER: I am planning to go for a shopping with my friends at Houston TX-IAH. Can you please help me with booking a direct flight?

ASSISTANT: Sure, we are here to help you in booking.

USER: Thank you.

ASSISTANT: What price would you like to put on flight ticket?

USER: I can afford up to 500.

ASSISTANT: Kindly share your source airport code.

USER: My takeoff airport code is Austin TX-AUS.

ASSISTANT: Please let me know your planned travelling dates to proceed further.

USER: I will fly on 04/24 and arrival on 04/26.

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

USER: Sure.

ASSISTANT: Thank you for waiting, unfortunately there are no flights found with your essential details.

USER: Ok, no problem.

ASSISTANT: Thank you for approaching us.

USER: Thank you for your response.