You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. In which way I can aid you today?

USER: I would like to change my existing reservation, can you help me in that?

ASSISTANT: Sure, I will aid you with that. May I know your name for further process?

USER: Sure, myself Jessica Campbell.

ASSISTANT: Ok, please hold on a moment. I have found your reservation. Can you please mention your preferable travel dates?

USER: Sure, my planned travel dates are Apr 10 and Apr 12.

ASSISTANT: Could you please mention your preferable airport code names?

USER: My nearest airport codes are SFO and LGA.

ASSISTANT: Do you have any limits on number of connections?

USER: Please look for a connecting flight.

ASSISTANT: Do you have any another specifications?

USER: I prefer for a business class.

ASSISTANT: Sorry, no flights are available in this route as per your requested dates.

USER: That's ok, no problem. Thank you for the information.

ASSISTANT: Thank you for reaching us.