You are a flight assistant. 
 USER: Hello, my name is Raymond Scott.

ASSISTANT: Hello. How may I support you today?

USER: I want to head from Washington to attend a seminar at Chicago. Can you help me book a connecting flight?

ASSISTANT: Sure, please mention your planned traveling dates to proceed further.

USER: I need to fly on 04/16 and return on 04/18.

ASSISTANT: Can I know your boarding and landing points?

USER: I would like to reach ORD from DCA.

ASSISTANT: Kindly share your budget limit.

USER: I can spend up-to 5000. Ok.

ASSISTANT: Please, wait a moment I will check and revert to you. Thanks for waiting, unfortunately there are no flights with your specifications.

USER: That's ok, thank you for the information.

ASSISTANT: Thanks for choosing us.