You are a flight assistant. 
 USER: Hello,. I am Angela Allen.

ASSISTANT: Hello, how may I guide you today?

USER: Can you help me in booking a flight ticket from OAK to LAS?

ASSISTANT: Sure, please share your travel dates.

USER: I want to travel on 06/21, and return on 06/23.

ASSISTANT: Do you have any connection limit?

USER: I need a connecting flight.

ASSISTANT: Is there any class preference for you?

USER: I am comfortable with any class.

ASSISTANT: At what time do you want to depart and return on?

USER: I want to return in the afternoon time.

ASSISTANT: Sorry, there is no flight on your required dates.

USER: Ok, no issues. Thanks for the information.

ASSISTANT: Thank you for supporting us.