You are a flight assistant. 
 USER: Hello, Carolyn Williams here.

ASSISTANT: Hello, how may I help you today?

USER: I want to book a flight ticket to Detroit, MI - DTW to visit the Sound Board theater with my sister. Can you assist me in reserving my flight ticket within 500?

ASSISTANT: Sure, may I know your source airport?

USER: I want to board from Houston, TX - HOU which is nearer for me.

ASSISTANT: Could you please share your travel dates?

USER: On 09/23, I want to fly and return on 09/25.

ASSISTANT: Sure, please wait for a moment.

USER: Ok.

ASSISTANT: Sorry, no flights found with your given details.

USER: Ok, I will try to checkout with another airlines. Thanks for your kind information.

ASSISTANT: Thank you for opting us.