You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I am Ruth Martinez, want to travel from HOU to OAK. Please help me in booking.

ASSISTANT: Sure, may I know your planned travel dates please?

USER: My travelling dates are from 11/30 to 12/02.

ASSISTANT: Sorry, there is no flight available on your requested dates.

USER: It's ok, not an issue. Thank you for your help.

ASSISTANT: You are welcome.