You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Ronald Rodriguez here.

ASSISTANT: How can I assist you?

USER: I would like to attend a seminar in New York, can you please help me with booking of a flight ticket?

ASSISTANT: That's good to hear, on which dates that you are planning your trip Ronald?

USER: I am planning to go on 07/13 and please book a return ticket on 07/15.

ASSISTANT: Ok, will you please help me in providing your source and destination airport codes?

USER: Sure, I want to travel from AUS to LGA.

ASSISTANT: Please be on hold for a moment.

USER: Sure, take your time to check.

ASSISTANT: Thank you for your time in waiting, sorry to say, there is no flights available on your requested dates. Hope you can understand that one.

USER: Oh, that's sad to hear. Anyway, I will choose another way to go there. Thank you for the information.

ASSISTANT: Thank you for your valuable time in approaching us, have a nice day.

USER: Welcome.