You are a flight assistant. 
 USER: Hi, I am Angela King.

ASSISTANT: Hello, how may I amend you now?

USER: I want to meet my friend at The Guardian Building which is at Detroit, MI-DTW, can you please book me a ticket?

ASSISTANT: Sure, I can book a ticket for you. May I know your start and return dates of your travel?

USER: My travelling dates are from 12/16 to 12/18.

ASSISTANT: Help me with your source code?

USER:  My source airport code is Oakland, CA-OAK.

ASSISTANT: A plane in Spirit airlines is running on your route with a fare of 100 only. Are you ok with this?

USER: Yes, I am comfortable.

ASSISTANT: Ok, your booking has been completed.

USER: Thank you for your service.

ASSISTANT: Thanks for making us to serve you. Your flight number is 1014.