You are a flight assistant. 
 USER: Hello, I am Melissa Walker.

ASSISTANT: Hello, how may I help you at this moment?

USER: Can you please book a ticket from MSP to IAD?

ASSISTANT: Sure, I will help you. Please send your travelling dates.

USER: Sure, I would like to go on 07/06 and return back on 07/08.

ASSISTANT: Please wait for a while.

USER: Ok, ensure it is a single connecting flight.

ASSISTANT: Sorry, there is no flight available on your required dates.

USER: That's ok, thank you for checking.

ASSISTANT: You are welcome. Thank you for reaching us, have a nice day.

USER: Welcome.