You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I am Benjamin Clark from San Francisco.

ASSISTANT: Ok.

USER: I want to attend for my niece's marriage in Denver, so please book a flight ticket from SFO to DEN.

ASSISTANT: Sure, can you share your trip dates?

USER: I want to fly on June 23, return on June 25.

ASSISTANT: Do you have any specifications?

USER: I need a connecting flight.

ASSISTANT: There is a connecting flight with number 1000 in airline AA, the fare is 100. Can I book it?

USER: You can reserve it.

ASSISTANT: Your ticket is reserved, happy journey.

USER: Thank you for your service.

ASSISTANT: Thank you for reaching us.