You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Margaret Brown.

ASSISTANT: How can I help you Margaret Brown?

USER: I want to attend the Brooklyn folk festival at New York, please book a flight ticket for me.

ASSISTANT: Sure, can you provide your journey dates please/.

USER: I will go on 03/04 and return on 03/06.

ASSISTANT: May I know your airport codes?

USER: My source and destination airport codes are  PHX and LGA.

ASSISTANT: Wait a moment please.

USER: Ok.

ASSISTANT: Sorry to say, there is no flight available on your preferable dates.

USER: Ok, no problem.

ASSISTANT: Thank you for contacting us.

USER: Thank you.