You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you?

USER: Will you please make me a plane reservation from SFO to PHX?

ASSISTANT: Sure, I can help you with that. May I know your travel dates please?

USER: I will leave on Apr 11th and return on Apr 13th.

ASSISTANT: Do you prefer break in between your journey?

USER: I need 1 lay by.

ASSISTANT: Please let me know if you have any other specifications.

USER: I am looking for an economy class.

ASSISTANT: May I know your good name please?

USER: I am Helen Lewis.

ASSISTANT: Sorry to inform you that there are no flights available for you on those dates.

USER: That's alright, thanks for your assistance.

ASSISTANT: Thank you for choosing us.