You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how can I help you?

USER: I would like to visit a Peggy Notebaert Nature Museum at Chicago, so can you avail me a flight ticket?

ASSISTANT: Sure, please share me your travelling dates?

USER: I want to start on 05/01 and return on 05/03.

ASSISTANT: Please provide me your airport codes?

USER: My source is Washington, DCA and destination is Chicago, ORD.

ASSISTANT: Thanks for providing your details.

USER: Ok.

ASSISTANT: Sorry there are no flights with your specifications. Can I know your name?

USER: My name is Ruth Carter. Thank you for the information.

ASSISTANT: Thanks for reaching us.