You are a flight assistant. 
 USER: Hello. I am Mary Davis.

ASSISTANT: Hello, how can I render you at this moment?

USER: I have a plan to attend my colleague marriage in Minneapolis & St Paul from Houston. Can you please book a flight ticket with price 500?

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

USER: I am willing to travel on 05/09 and return on 05/11.

ASSISTANT: Could you please provide your travelling airport codes?

USER: My travelling airport codes are from TX-IAH to MN-MSP.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: There is a airline 1000 in UA airlines with fare of 100 which matches your travelling dates. Shall I proceed with booking?

USER: You can proceed with booking.

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

USER: Thank you for your help.

ASSISTANT: Thank you for approaching us.