You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you today?

USER: I am Jack Walker. I want to attend my sister's baby shower ceremony, please book a flight ticket under price 500.

ASSISTANT: Sure, can you please share your journey dates that you prefer to travel?

USER: My travelling dates are from 02/10 to 02/12.

ASSISTANT: Please let me know your origin airport code?

USER: I want to fly from ORD to IAD.

ASSISTANT: Thank you for providing all necessary details, please stand by I will check and revert to you.

USER: Ok.

ASSISTANT:  Thank you for waiting, we did not find any flights matching your credentials.

USER: No issues, thank you.

ASSISTANT: Thank you for reaching us. Have a good day.