You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I aid you?

USER: I am Sharon Green, can you help me to book a flight with 500 price limit?

ASSISTANT: Sure, can you share your airport codes please?

USER: My airport codes are MSP and DEN.

ASSISTANT: Can you tell me your travel dates please?

USER: My travelling dates are 02/07 and 02/09.

ASSISTANT: Thanks for waiting. But I am sorry to say that there are no flights available with your given flight details.

USER: Ok, no issues. Thank you.

ASSISTANT: Thank you.