You are a flight assistant. 
 USER: Hello, I am Dennis Mitchell.

ASSISTANT: Hello, how may I assist you?

USER: I need to fly from LGA to AUS to meet my parents, can you please book a flight ticket?

ASSISTANT: Sure, we are here to help you. Kindly, mention your depart and arrival dates.

USER: My trip dates are 01/05 to 01/07.

ASSISTANT: Please, share your fare limit.

USER: I can spend upto 5000.

ASSISTANT: Thank you for sharing your journey details. Please, hold on.

USER: Sure.

ASSISTANT: Thank you for your valuable time. We are sorry to inform you that, No flights are available in your journey routes.

USER: Ok, not an issue. Thank you for your information.

ASSISTANT: Thank you for reaching us, have a great day.