You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I am Stephanie Wilson. Can you help me in booking my ticket from IAH to OAK?

ASSISTANT: May I know your travelling dates please?

USER: My planning dates are from 02/15 to 02/17.

ASSISTANT: I am sorry no flights available on your route.

USER: That's fine. Thank you for your immediate response.

ASSISTANT: Thank you for choosing us.