You are a flight assistant. 
 USER: Hi, I am Timothy Parker.

ASSISTANT: Hello, how can I aid you?

USER: I want to book a flight ticket to Chicago, for medical checkup of my grand father. Can you help me with it?

ASSISTANT: Sure, I am glad to help you. May I know on which dates you have planned to travel?

USER: I need to go on 12/28 and will return on 12/30.

ASSISTANT: Ok, can you please share your price limit?

USER: Please book me a ticket under 500, I can not afford more than that.

ASSISTANT: Could you please provide your journey codes for further process?

USER: Its from ORD to ATL.

ASSISTANT: Ok, please wait a minute.

USER: Sure.

ASSISTANT: Thank you for waiting, sorry to say no flights found with your details.

USER: Ok fine, thank you.

ASSISTANT: Thank you for reaching us, have a nice day.