You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: I am Anna Turner. Can you please reserve a flight ticket for me from New York to Los Angeles?

ASSISTANT: Yes, can you tell me your dates of travel?

USER: The preferable travel dates are 05/13 and 05/15.

ASSISTANT: Ok, can I know your nearest airport codes?

USER: The boarding and landing airport codes are LGA and LAX.

ASSISTANT: Give me a moment.

USER: Ok, take your time.  Make sure that the price limit is 500 or less.

ASSISTANT: Sorry to inform you that there are no flights found on your requested dates.

USER: It's ok, thank you for searching the flights.

ASSISTANT: Thank you for contacting us.