You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I guide you?

USER: Nancy King here. I am looking a flight from IAH to OAK, can you help me in booking?

ASSISTANT: Sure, can I know your preferable dates?

USER: I would like to move on 09 Jan and return on 11 Jan.

ASSISTANT: I am sorry, there are no flights available.

USER: It's ok, thank you for giving information.