You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I support you today?

USER: Myself William Clark from New York. I want to change my travel dates in my previous reservation so can you please help me with that?

ASSISTANT: Sure, I'll help you in changing an existing reservation.

USER: Thank you for your response.

ASSISTANT: Please wait a moment I will check the reservation list.

USER: Ok.

ASSISTANT: Thank you for waiting, happy to inform you that we found a reservation by this name.

USER: Oh! Thanks.

ASSISTANT: Please let me know your updated journey dates.

USER: I want to take off on Feb 12 and please confirm my return ticket also on Feb 14.

ASSISTANT: May I know your airport codes to proceed further?

USER: I want to fly from JFK and destination airport is MSP.

ASSISTANT: Ok, please wait a moment.

USER: Ok.

ASSISTANT: Thank you for waiting, we found an UA airline matching your essential details with single connection and the flight number-1007. Shall I book the ticket?

USER: Please confirm this flight ticket for me.

ASSISTANT: Your ticket ticket has been reserved.

USER: Thank you for your help.

ASSISTANT: It's pleasure to serve you.