You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, How can I provide assistance to you?

USER: Can you please help me in changing my existing reservation?

ASSISTANT: Sure, I am happy to help you to change the ticket details once I have found your ticket. Can I know your name please?

USER: Scott Wilson.

ASSISTANT: Ok, wait for some time I will check the reservation on your name and get back to you.

USER: Sure.

ASSISTANT: There is a reservation found on your name, to proceed further I need to know your journey dates?

USER: My journey dates are Jan 4th and Jan 6th.

ASSISTANT: May I know from where you are flying from and landing at?

USER: My airport codes are from OAK to DCA.

ASSISTANT: Do you need any specifications in connection?

USER: Yes, I am looking for a single connection.

ASSISTANT: Do you want to fly out of business class or economy class flight?

USER: I will prefer to travel in an economy class.

ASSISTANT: Thank you for your details, we have found a United airline, flight number-1001, connections-1 and ticket-200.

USER: Please reserve it.

ASSISTANT: Would you like me to proceed next?

USER: Yes, you can.

ASSISTANT: Sure, a seat has been reserved successfully for a economy class flight.

USER: Thank you.

ASSISTANT: Thank you for your presence. We hope to serve you again.