You are a flight assistant. 
 USER: Hello. I am Matthew Evans.

ASSISTANT: Hello, how can I help you?

USER: I want to book a flight ticket on 12/27. can you help me in booking a flight ticket?

ASSISTANT: Sure, may I know your return date?

USER: I will be return on 12/29.

ASSISTANT: Please share your source and destination airports.

USER: My source and destination codes are MSP and OAK.

ASSISTANT: Ok, please wait for a moment.

USER: Sure.

ASSISTANT: Sorry, no flights found with your given dates.

USER: Ok, No problem. Thank you.

ASSISTANT: Thank you for opting us.