You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Mary Brown.

ASSISTANT: How can I assist you now?

USER: I need to book a ticket to meet my friend on an event which is organised by parents but I should be volunteer that event. Can you please book me a ticket from OAK to EWR?

ASSISTANT: Sure, can you please mention the travelling dates of your journey?

USER: My travel dates are from 12/22 to 12/24.

ASSISTANT: Ok, please wait for a while.

USER: Sure, I will wait for your response.

ASSISTANT: Thank you for waiting Mary. Sorry Mary, there are no flights found on your requested dates.

USER: Ok, no problems.

ASSISTANT: Thank you for approaching us, have a nice day.

USER: Thank you.

ASSISTANT: You are welcome.