You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you for the day?

USER: Can you please help me in booking my flight ticket from OAK to IAH?

ASSISTANT: When you are willing to travel?

USER: Sure, my travelling dates are from 11/11 to 11/13.

ASSISTANT: Do you have any connection limit?

USER: No.

ASSISTANT: May, I know your good name?

USER: Myself Ryan Green.

ASSISTANT: We found 1024 UA airlines with single connection with price 200.

USER: Please make sure, my depart time should be in the evening and I am looking for business class.

ASSISTANT: Sorry, we found no flights on your given specifications.

USER: It's ok, thank you.

ASSISTANT: Thank you for reaching us.