You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you today?

USER: I want to book a ticket from OAK to IAH. Could you book a ticket?

ASSISTANT: Sure, may I know your planned travel dates?

USER: Departure is Sept, 24 and return date is Sept, 26.

ASSISTANT: Do you have any other specifications?

USER: Make sure my return time should be afternoon.

ASSISTANT: Your good name please.

USER: My name is Samantha Walker.

ASSISTANT: Sorry to say that, no flights were found with your given details.

USER: Thanks.

ASSISTANT: Thank you for reaching us.