You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: My name is Charles Wilson. I want to book a flight ticket within 1000 price.

ASSISTANT: May I know your airport codes?

USER: I need to travel from THL to DTW for visitation purpose.

ASSISTANT: Can you share your preferable journey dates?

USER: My origin is PHL. My journey dates are from 07/02 to 07/04.

ASSISTANT: No flights found with your details.

USER: Ok, Not an issue.

ASSISTANT: Thank you, have a nice day.

USER: Thanks for your information.