You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you today?

USER: Please help me to book a direct flight to Chicago to treat an emergency case.

ASSISTANT: Sure, may I know your planned journey dates?

USER: Sure, I need to depart on 05/30 and my return date will be on 06/01.

ASSISTANT: May I know your airport codes?

USER: My boarding and landing airport codes are LAX and ORD.

ASSISTANT: Do you have any specifications?

USER: No, please proceed.

ASSISTANT: May I know your good name?

USER: I am Elizabeth Allen.

ASSISTANT: Sorry, there are no flights found with your given details.

USER: That's ok, not an issue. Thank you for your information.

ASSISTANT: Thank you for reaching us.