You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: I want to change my existing reservation, due to some health issue. Can you help me?

ASSISTANT: Sure, I will help you with that.

USER: Thank you.

ASSISTANT: May I know your good name?

USER: Ok, I am Ruth Roberts.

ASSISTANT: We found a reservation on your name , Can you please share your travelling dates?

USER: Ok, my planned trip dates are on Aug 13 and return on Aug 15.

ASSISTANT: May I know your airport codes?

USER: Ok, my airport codes are from BOS to ATL.

ASSISTANT: Do you have any connection limit?

USER: Ok, I need a single connecting flight.

ASSISTANT: Is there any other preferences?

USER: No, thanks for asking.

ASSISTANT: We found a Frontier airline with flight number 1021 and fare 400 with class is economy. Shall I proceed with booking?

USER: Ok, you can proceed with the ticket booking.

ASSISTANT: Your flight ticket has been reserved.

USER: Thank you for your help.

ASSISTANT: Thank you for reaching us.