You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I guide you?

USER: I am planning to start on 02/04 and return back on 02/06.

ASSISTANT: Sure, can I know your airport codes?

USER: I am Emma Roberts, I would like to book a ticket from IAH to EWR.

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

USER: ok, thank you for the information.

ASSISTANT: Thank you, have a good day.