You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I aid you?

USER: Can you help me to book a flight from HOU to OAK?

ASSISTANT: Sure, can you share your trip dates?

USER: My travelling dates are 07/27 and 07/29.

ASSISTANT: Do you have any preferences?

USER: I prefer to travel in business class and connecting flight.

ASSISTANT: May I know your name?

USER: My name is Debra Thomas.

ASSISTANT: Sorry, there is no flight on your given dates.

USER: I prefer normal cost airline. Ok, no issues.

ASSISTANT: Thank you for reaching us.

USER: Thank you for your time.