You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: Can you help me to book a flight ticket from MSP to EWR?

ASSISTANT: Sure, may I know your travelling dates?

USER: My period of journey is 09/17 and 09/19.

ASSISTANT: Ok, could I know your name please?

USER: Nicholas Campbell here.

ASSISTANT: Sorry, all flight tickets are sold out in your requested month.

USER: It's ok, not a problem. Thanks for checking.

ASSISTANT: My pleasure.