You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: I'm Christopher Anderson. I have to go for seafood festival at ATL, can you please book me a ticket from IAH?

ASSISTANT: Sure, could you please tell me your preferable travelling dates?

USER: My travel dates are 02/25 and 02/27.

ASSISTANT: Ok, please allow me a moment.

USER: Sure.

ASSISTANT: Sorry, all flight tickets are sold out in your planned month.

USER: That's ok, I will find some other way to go there. Thank you anyways.

ASSISTANT: Thank you for opting us.