You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: I am Christopher Hill, I want to book a flight ticket from New York, NY - LGA to Houston, TX - IAH.

ASSISTANT: Ok, I can do that for you. May I know your travelling dates?

USER: Sure, I want to start on 07/04 and end on 07/06.

ASSISTANT: Ok, let me check what flights are available.

USER: OK.

ASSISTANT: We found a Hawaiian airline with flight number 1019 and price of 1200 available matching your particulars. Shall I book the ticket?

USER: Make sure price must be 200.

ASSISTANT: Ok. We dont have any flights available in that price range.

USER: OK, no issues. Thanks for your service.

ASSISTANT: Thank you for reaching us.