You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. Can you please let me know how may I help you?

USER: I want to book a direct flight ticket to attend an emergency case at IL. Can you help me?

ASSISTANT: Sure, I am here to help you to book the direct flight. Can you please mention your journey dates?

USER: Jan 21st and 23rd are my travelling dates.

ASSISTANT: What are your genesis and terminus airport codes?

USER: OAK and ORD are my airport codes.

ASSISTANT: Ok, do you have any particular timings to depart and return?

USER: No.

ASSISTANT: May I know your full name please?

USER: Laura Gonzalez.

ASSISTANT: I am really sorry to inform you that, there are no direct flights found in this route on the dates you have given.

USER: No issue, Thank you for the information.

ASSISTANT: My pleasure to inform you. Thank you for communicating with us.