You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Helen Green.

ASSISTANT: How may I help you?

USER: I want to book a ticket to Phoenix to meet my children who studies at Phoenix international school.

ASSISTANT: Sure, do you have any price limit?

USER: Price limit is 500.

ASSISTANT: Help me with the travel dates?

USER: Travel dates are on 06/24 and 06/26.

ASSISTANT: May I know your airport codes?

USER: Airport codes are MCO to PHX.

ASSISTANT: We do not found any flights running to your prefferable dates.

USER: Ok, thank you for informing.

ASSISTANT: Thanks for your approach.