You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I aid you today?

USER: Can you please help me in booking my flight ticket from HOU to SFO?

ASSISTANT: Ok, I am here to help you with that. Can I know your journey dates?

USER: My travelling dates are Apr 02 and Apr 04.

ASSISTANT: Ok, do you have any other requirements?

USER: I need my return ticket at afternoon time.

ASSISTANT: May I know your good name?

USER: Myself Nancy Hall.

ASSISTANT: Please wait for sometime. Sorry to say that, there are no flights available based on your travelling dates.

USER: Thanks for your information.

ASSISTANT: Thank you for approaching us.