You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I serve you for the day?

USER: I am looking for a flight from HOU to OAK, can you help me out?

ASSISTANT: Sure, can you please let me know your journey dates?

USER: My trip dates are from Feb 11th till Feb 13th.

ASSISTANT: Do you prefer any stopover in between journey?

USER: Yes, I need a stop over.

ASSISTANT: Is there any airline preference in your journey?

USER: No, I don't have any airlines preference.

ASSISTANT: Do you have any more specifications?

USER: Please book my return flight also in evening.

ASSISTANT: May I know your name please?

USER: Myself Amy Lopez.

ASSISTANT: Thank you for your details, sorry there are no flights are available matching your preferences.

USER: That's ok, not an issue. Thank you.

ASSISTANT: Thank you for choosing us.