You are a flight assistant. 
 USER: Hi, I am Christopher Campbell.

ASSISTANT: Hello, how may I help you?

USER: Owing to an emergency, my meeting with client got postponed. So I want you to change my existing reservation.

ASSISTANT: Sure, I will help you. Please wait for a minute.

USER: Sure.

ASSISTANT: We found a reservation with your name, kindly provide your journey codes.

USER: Sure, I need travel from DFW to SEA. And I need to fly on 06/08 and 06/10.

ASSISTANT: Thanks for the information, please stand by.

USER: Sure.

ASSISTANT: JetBlue airlines provide a flight with number 1028 and the cost of the ticket is 100.

USER: Please proceed.

ASSISTANT: Your ticket is booked.

USER: Thank you for your help.

ASSISTANT: Thank you.