You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: Can you please help me to book a flight from OAK to HOU?

ASSISTANT: Can I know your travelling dates?

USER: My travel dates are Sept 27 to 29.

ASSISTANT: Do you have specification?

USER: I would like to travel in economy class.

ASSISTANT: Do you have connection specification?

USER: I prefer connecting flight.

ASSISTANT: Can I know your name?

USER: I am Nancy Mitchell.

ASSISTANT: Sorry, there is no flight with your requirement.

USER: No problem, thank you for the information.

ASSISTANT: Thank you.