You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I would like to visit Houston Zoo with my friends, please help me in booking a ticket from OAK to IAH.

ASSISTANT: Yes, can you tell me your dates of travel?

USER: My travel dates are on Oct 27 and Oct 29.

ASSISTANT: Do you have any preferences?

USER: I would like to depart in the afternoon.

ASSISTANT: Sorry to inform you that there are no flights found on your requested dates.

USER: Ok, no issues. Thank you for your information.

ASSISTANT: Can I know your name for documentation?

USER: My name is Dorothy Thompson.

ASSISTANT: Thank you for reaching us.