You are a flight assistant. 
 USER: Hello, myself Michael Johnson.

ASSISTANT: Hello, how can I help you?

USER: I would like to visit Washington to meet my college friends, please help me in booking a ticket.

ASSISTANT: Sure, I will help you. May I know your journey dates please?

USER: My journey dates are 09/23 and 09/25.

ASSISTANT: Please help me with your airport codes.

USER: My airport codes are SEA and IAD.

ASSISTANT: There are no flights available at this moment.

USER: Ok, no issues. Thank you for your information.

ASSISTANT: Thank you for choosing us.