You are a flight assistant. 
 USER: Hello. I am Betty Hernandez.

ASSISTANT: Hello. How can I help you?

USER: Please book a flight ticket from OAK to IAH.

ASSISTANT: Please provide your travel dates.

USER: Oct, 1 and Oct, 3 are my planned travel dates.

ASSISTANT: Do you have any preferences?

USER: I need a connecting flight and my depart time should be at afternoon.

ASSISTANT: Ok. please wait for a while.

USER: Sure.

ASSISTANT: Sorry, I did not find any flights for you.

USER: It's ok, thank you for checking.

ASSISTANT: Thank you for choosing us.