You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

USER: Could you please change my existing reservation?

ASSISTANT: Sure, I am here to assist you.

USER: Thank you.

ASSISTANT: May I know your name to proceed further?

USER: My name is Jonathan Clark.

ASSISTANT: Ok, please wait.

USER: Sure.

ASSISTANT: Thank you for your time, we found a reservation on your name. May I know your new travelling dates?

USER: My new travelling dates are Oct 15 and Oct 17.

ASSISTANT: Ok, Kindly mention your source and destination.

USER: My source is SFO and destination is IAD.

ASSISTANT: Ok, Do you have any class preference?

USER: No.

ASSISTANT: Thank you for providing details, we found a connecting flight in 1001 Frontier Airlines with a fare of 100. Can I proceed?

USER: Yes, proceed.

ASSISTANT: Your ticket has been booked.

USER: Thank you.

ASSISTANT: Thank you for reaching us.