You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: James Collins here.

ASSISTANT: How may I assist you?

USER: I want to attend a Marriage in Oakland. Can you please help me for booking the flight ticket?

ASSISTANT: Sure, I am here to help you out. May I know your airport codes please?

USER: My airport codes are from IAH to OAK.

ASSISTANT: May I know your travelling dates please?

USER: My travelling dates are from 07/05 to 07/07. Make sure my price limit is 200.

ASSISTANT: James Collins, there are no flights available in your route.

USER: Anyway, thanks for the information.

ASSISTANT: Thank you for reaching us.