You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you?

USER: I am Rebecca Hernandez, I want to book a flight ticket from IAH to LAX, can you help me out?

ASSISTANT: Sure, I can help you with that. May I know your travel dates please?

USER: My travel dates are Dec 17 and Dec 19.

ASSISTANT: May I know your class preference please?

USER: No.

ASSISTANT: Do you have any time concerns?

USER: My return time is afternoon.

ASSISTANT: Please let me know if you have any other specifications.

USER: No.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Sorry to inform you that there are no flights available for you on those dates with your given details.

USER: Ok, no issues. Thank you.

ASSISTANT: Thank you for choosing us.