You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you today?

USER: Please assist me in booking a flight ticket from SFO to DCA.

ASSISTANT: Sure, could you please mention with your dates of journey?

USER: My dates of journey are from Feb 20th to Feb 22nd.

ASSISTANT: May I know your good name please?

USER: I am Matthew Johnson.

ASSISTANT: Do you have any other help from my side please?

USER: Yes, I want a business class which returns in the morning.

ASSISTANT: Please wait for a moment.

USER: Ok.

ASSISTANT: Sorry Johnson, there is no flight found as per your travelling details.

USER: Ok, no problem. Thank you.

ASSISTANT: You are welcome.