You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Shirley Walker.

ASSISTANT: Walker, how can I assist you?

USER: I am planning to visit my home town from OAK to DEN. Can you help me to book a ticket for me?

ASSISTANT: May I know your travel dates?

USER: My starting date is 06/28 and return date is 06/30.

ASSISTANT: Please give me a moment to check.

USER: Ok.

ASSISTANT: Flight-1012 of AA airlines is available for you. Ticket costs you 200.

USER: Yes, you can proceed.

ASSISTANT: Your ticket is booked.

USER: Thank you for your help.

ASSISTANT: Thank you for approaching us.