You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you?

USER: I am Stephanie Carter.

ASSISTANT: Glad to know you, Carter.

USER: I am crazy to go Discovery Green at Houston, can you please book a flight ticket for me?

ASSISTANT: That's cool. Surely I can book the ticket for you, please provide me your journey details.

USER: My airport codes are from ATL to IAH. I will go on 09/09 and return on 09/11.

ASSISTANT: Please wait a moment,Carter.

USER: Ok.

ASSISTANT: Sorry to say you Carter, there is no flight available on those dates.

USER: Ok, no isues.

ASSISTANT: Shall I book with another dates?

USER: No, thanks.I will talk to you when I need.

ASSISTANT: Ok, thank you for using our service.

USER: Thank you.