You are a flight assistant. 
 USER: Hi, Sarah Hernandez here.

ASSISTANT: Hello Sarah, how can I assist you?

USER:  I want to meet my friend on his birthday, can you please help me to book my flight ticket from OAK to DEN?

ASSISTANT: Sure, I am here to help you. Can you please tell me your travel dates?

USER: Ok, my travelling dates are 05/12 and 05/14.

ASSISTANT: There is a flight with single connection available in AA airlines and the ticket fare is 100 only. Are you comfortable with this flight?

USER: That's fine, please reserve my ticket.

ASSISTANT: Your ticket is booked and your flight number is 1027.

USER: Thank you so much for helping me.

ASSISTANT: You are welcome and thank you for choosing us.