You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I  help you?

USER: Can you please reserve me a flight ticket from OAK to HOU?

ASSISTANT: Your travelling dates please?

USER: My trip dates are 10/31 - 11/02.

ASSISTANT: Do you have any specifications?

USER: My return time is in the evening.

ASSISTANT: Sorry, there is no flight available with your requirements.

USER: It's ok, thank you.

ASSISTANT: May I know your name?

USER: I am Catherine Martin.

ASSISTANT: Thank you for reaching us.