You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: I am Melissa King. Can you book a flight ticket from HOU to IAH?

ASSISTANT: Sure, we are here to help you.

USER: Thank you.

ASSISTANT: Can you share me your trip dates?

USER: I would start on 03/30 and return on 04/01.

ASSISTANT: Do you need any halt in your journey?

USER: Yes, I need a halt.

ASSISTANT: Is there any class preference for you?

USER: No.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: Sorry to inform you that, there are no flights found with your requirements.

USER: It's ok, no problem.

ASSISTANT: Thank you for choosing us.

USER: Thank you.