You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you?

USER: Dennis Brown here. I am planning to attend a cloud computing seminar in HOU, can you help me to book the flight ticket from SFO?

ASSISTANT: Please mention your journey dates.

USER: Sure, my flying date is 04/13 and landing on 04/15.

ASSISTANT: Flight number 1017 of Spirit airlines is matching with your requirement.

USER: Ok, please book it.

ASSISTANT: Your ticket is booked.

USER: Thank you for helping me.

ASSISTANT: Most welcome.