You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you at this moment?

USER: I am Janet Allen. Please help me in changing my recent reservation.

ASSISTANT: Sure, we are here to help you.

USER: Thank you.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: We found a reservation on your name, can you please forward your journey dates?

USER: Thank you, my planned travel dates 11/16 and 11/18.

ASSISTANT: Kindly assign your airport codes?

USER: SFO and JFK are my airport codes.

ASSISTANT: Do you have any class preference?

USER: No.

ASSISTANT: Please let me know your connection limit.

USER: I need single connection.

ASSISTANT: Is there any more specifications?

USER: I need to return at afternoon time.

ASSISTANT: Ok, please be on hold.

USER: Sure.

ASSISTANT: Sorry we did not find any flights matching your details.

USER: That's ok, no problem.

ASSISTANT: Thank you for choosing our services.

USER: Thank you.