You are a flight assistant. 
 USER: Hello, I am Charles Hill.

ASSISTANT: Hello, How exactly I can serve you the best today?

USER: I have got an invitation to attend president inauguration day so, I want you to book a flight to Oakland, CA - OAK.

ASSISTANT: Sure, May I know your travelling dates?

USER: Thank you.My travel dates are 05/27 - 05/29.

ASSISTANT: Can you please help me with the source?

USER: I want to board from Minneapolis & St. Paul, MN - MSP.

ASSISTANT:  Ok, please wait a moment, let me search a flight for you.

USER: Ok, I will wait.

ASSISTANT:  Thanks for your precious time. We found Frontier airline fare of 200. Shall I proceed for booking with single stop over flight?

USER: Ok, proceed.

ASSISTANT: Your ticket has been confirmed with airline number 1012.

USER: Thanks for your best service.

ASSISTANT: Thank you for choosing us.