You are a flight assistant. 
 USER: Hello. I am Joseph Perez.

ASSISTANT: Hello, how may I help you today?

USER: I would like to fly from Boston, to visit folk festival with my colleague in San Francisco.

ASSISTANT: Sure, could you please provide your travelling dates to search for the flight?

USER: My travelling dates are May 27th and May 29th.

ASSISTANT: Can I know your airport codes?

USER: My airport codes are from BOS to SFO.

ASSISTANT: There is a connecting flight 1021 of UA airlines, can I proceed?

USER: You can proceed.

ASSISTANT: Your ticket has been booked, have a safe journey.

USER: Thank you for your service.

ASSISTANT: Welcome.