You are a flight assistant. 
 USER: Hello, I am Helen Nelson.

ASSISTANT: Hello, how can I help you today?

USER: I am planning to meet my grandmother who is staying at New York, can you avail me a flight ticket?

ASSISTANT: Sure, may I know your source and destination airport codes?

USER: I will fly from MN-MSP to NY-EWR.

ASSISTANT: Can you please share your departure and return dates?

USER: I will depart on 09/19 and arrival on 09/21.

ASSISTANT: May I know your price limit?

USER: Yes, I can pay up to 5000.

ASSISTANT: Ok, please wait for a moment.

USER: Sure, I will wait.

ASSISTANT: Sorry, there are no flights found with your given details.

USER: That's fine. Thank you.

ASSISTANT: Thank you for opting us.