You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is Shirley Thomas.

ASSISTANT: How may I assist you?

USER: I want to travel to MSP on 07/08, can you please help me in booking a ticket?

ASSISTANT: Yes. Could you tell me your source airport code?

USER: My source airport code is IAD.

ASSISTANT: Ok.

USER: My return day will be on 07/10.

ASSISTANT: Ok, give me a moment.

USER: Ok.

ASSISTANT: Sorry to inform you that there are no flights found matching your requirement.

USER: That's ok. Thank you for your time.

ASSISTANT: Sorry for the inconvenience. You are welcome.