You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you?

USER: My name is Ashley Allen. I have a business meeting in San Francisco. Can you help me for booking a flight ticket?

ASSISTANT: Sure, help me with your travelling dates.

USER: My travelling dates are from 08/24 till 08/26.

ASSISTANT: May I know your airport codes?

USER: My travelling airport codes are from IAD to SFO.

ASSISTANT: There is a connecting flight with fare 200, the number is 1019 in airline Delta. Can I book it?

USER: Ok, please proceed for booking.

ASSISTANT: Your ticket is reserved.

USER: Thank you for booking.

ASSISTANT: Thank you for reaching us.

USER: Welcome.