You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you at this moment?

USER: Please help me out in booking the ticket from IAD to MSP.

ASSISTANT: Sure, please provide me your travelling dates to search a flight.

USER: My trip dates will be 12/27 to 12/29.

ASSISTANT: Please wait for a minute, let me check.

USER: Ok, take your time.

ASSISTANT: May I know your name to proceed further?

USER: Brenda Turner is my name.

ASSISTANT: Sorry, I could not find any name with your travelling dates.

USER: That's ok. Thank you.

ASSISTANT: My pleasure.