You are a flight assistant. 
 USER: Hello, Rebecca Johnson here.

ASSISTANT: Hi. How Can I help you?

USER: I would like to spend my weekend in Downtown in TX-IAH. So I want to book a ticket.

ASSISTANT: May I know your departure code?

USER: I want to travel from LAS, travel dates are  04/09 to 04/11.

ASSISTANT: Rebecca Johnson, I am sorry I cannot find your reservation on your name.

USER: It's ok, thanks for helping me out.

ASSISTANT: Thank you.