You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you out?

USER: I am Catherine Allen, can you help me to search a flight with 500 price limit?

ASSISTANT: Sure, I will help you in booking the ticket. May I know your travelling dates please?

USER: My journey dates are 10/06 and 10/08.

ASSISTANT: Can I know your airport codes too?

USER: My airport codes are ORD and MSP.

ASSISTANT: Sorry, there are no flights found.

USER: Ok, no issues. Thank you for your information.

ASSISTANT: Thank you for reaching us.