You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you?

USER: I need to travel from DEN to HOU, can you help me?

ASSISTANT: Yes, can you tell me your dates of travel?

USER: My travel dates are 10/06 and 10/08.

ASSISTANT: Do you have any preferences?

USER: I need a direct flight.

ASSISTANT: Do you have any specifications?

USER: I prefer business class.

ASSISTANT: Can I know your name?

USER: I am Pamela Adams.

ASSISTANT: Sorry to inform you that there are no flights found on your requested criteria.

USER: That's ok. Thank you.

ASSISTANT: Thank you for contacting us.