You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I guide you for today?

USER: As my tournament got postponed, I want to change my existing reservation. Can you help me out?

ASSISTANT: May I know your name?

USER: Sure, my name is Joshua Robinson.

ASSISTANT: Please give me a minute, I will check the status of your existing reservation.

USER: Sure.

ASSISTANT: I found your existing reservation. May I know your changed journey dates?

USER: Yes, my travelling dates will be 07/06 and 07/08.

ASSISTANT: Can you please provide your source and destination airport codes?

USER: Ok, I want to fly from OAK to HOU.

ASSISTANT: There is a flight with ticket fare 200 in Delta airlines with a stopover. Is it ok for you?

USER: Ok, proceed with my booking.

ASSISTANT: Your booking is confirmed with flight number 1000.

USER: Thank you.

ASSISTANT: Thank you for contacting us, have a nice day.