You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how can I help you?

USER: I am Rebecca Jackson, as my exam got postponed I want to change my existing reservation.

ASSISTANT: Sure, Please wait for a while.

USER: Ok.

ASSISTANT: Thank you for being patient, we are glad to inform you that there is a reservation found on your specified name. To change your reservation, Can you please provide your journey details?

USER: Ok, my new travelling dates are from 10/16 to 10/18 and my origin airport is  Denver, CO- DEN and  Dest airport is Washington DC- IAD.

ASSISTANT: Ok, Please wait for a while.

USER: Sure.

ASSISTANT: Thanks for your patience, There is an Frontier airline with flight number 1015 and price is 100. Shall I proceed for booking?

USER: Please proceed with booking.

ASSISTANT: Ok, Your ticket has been booked.

USER: Thank your for helping me with reservation.

ASSISTANT: Have a safe journey. Thank you for choosing us.