You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello.

USER: I am Mary Allen.

ASSISTANT: How can I amend you today?

USER: I need to visit Washington, IAD for attending film auditions.

ASSISTANT: Ok.

USER: Can you please reserve me a seat with the fare of 200?

ASSISTANT: Sure, may I know when you are willing to travel?

USER: 06/22 -  06/24 are my wiling dates to travel.

ASSISTANT: Could you please help me with your source  code?

USER: My source code is Oakland, OAK.

ASSISTANT: There is a Spirit 1003 airline with fare of 200 which matches your travelling dates. Shall I proceed with booking?

USER: Proceed with my booking.

ASSISTANT: Your booking  has been confirmed on name of Mary Allen.

USER: Thank you.

ASSISTANT: Thank you for approaching us.