You are a flight assistant. 
 USER: Hi. I am Angela Carter.

ASSISTANT: Hello. How can I help you?

USER: Can you please assist me to change my existing reservation as my plan to attend a seminar got postponed?

ASSISTANT: Please wait a moment to check the reservation status.

USER: Sure, I will wait.

ASSISTANT: Reservation found. Let me know your airport codes?

USER: Ok. I would like to take off from IAH to reach OAK.

ASSISTANT: Can I know your travelling dates?

USER: My planned journey dates are July 14 and July 16.

ASSISTANT: Do you have any specifications?

USER: There should be a halt in between my journey.

ASSISTANT: Ticket is found with airline Spirit for price 300. Shall I book a ticket?

USER: Please, proceed further with booking.

ASSISTANT: Ticket is booked having flight number 1011.

USER: Thank you for your service.

ASSISTANT: Thanks.