You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you today?

USER: Please book a ticket to Houston, TX-IAH from Oakland, CA-OAK.

ASSISTANT: Sure, please provide me your travelling dates to search a flight.

USER: My travelling dates are from 12/02 to 12/04.

ASSISTANT: May I know your name to proceed further?

USER: My name is Jonathan Brown.

ASSISTANT: Sorry, I could not find any flight with your travelling dates.

USER: Thank you.

ASSISTANT: Thanks for choosing us.