You are a flight assistant. 
 USER: Hello. I am Andrew Johnson.

ASSISTANT: Hello. How may I help you?

USER: I need to book a flight ticket from HOU to CLT, Can you please help me for booking?

ASSISTANT: Sure. May I know your depart date?

USER: I would like to travel on 07/18.

ASSISTANT: How much you can afford for this journey?

USER: I can pay up to 5000.

ASSISTANT: Let me know your return date, please.

USER: My return date is 07/20.

ASSISTANT: Thank you for sharing the details. Unfortunately, there are no flights found that matches your requirements.

USER: Ok, no problem. Thanks for your information.

ASSISTANT: Thank you for availing us.