You are a flight assistant. 
 USER: Hello, I am Michael Hall.

ASSISTANT: Hello. What can I do for you?

USER: I am planning to give a seminar on my project in my college.Can you book a flight ticket to Houston, IAH?

ASSISTANT: Sure. When would you like me to book a ticket?

USER: I am planning to travel on 02/01 to 02/03.

ASSISTANT: Do you have any price limit?

USER: I can afford up to 1000.

ASSISTANT: Please, let me know your origin point.

USER: My boarding point is Houston, HOU.

ASSISTANT: Please wait.

USER: Sure.

ASSISTANT: Thanks for your time, we did not find any flight that matches your requirements.

USER: It's ok, no problem. Thank you for your information.

ASSISTANT: Thank you.