You are a flight assistant. 
 USER: Hello, I am Dennis Adams.

ASSISTANT: Hello, how may I help you?

USER: I need to reach HOU to attend a party meeting there. Can you book me a ticket from LGA?

ASSISTANT: Sure, I will help you with that. Can I have your travel dates please?

USER: I would start on Nov 7th and return on 9th.

ASSISTANT: Do you have any requirements?

USER: Yes, I need a less expensive flight within price 500.

ASSISTANT: There is no flights were available for you on your route.

USER: That's fine, thanks for your response.

ASSISTANT: Thank you for reaching us, have a nice day.