You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I want to visit Houston whose airport code is HOU. Please help me in booking my ticket from SFO.

ASSISTANT: On which dates you are planning to travel?

USER: I am planning to travel on 05/31 and want to return on 06/02.

ASSISTANT: Do you have any other requirements?

USER: I am looking for normal cost flight with 1 connection.

ASSISTANT: May I know your good name please?

USER: My name is Stephen Brown.

ASSISTANT: Sorry Stephen, we regret to inform you that there is no flights available as per your request.

USER: It's ok, thank you for your help.

ASSISTANT: Most welcome.