You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I need to change my reservation due to my planned event got postponed so please help me with that.

ASSISTANT: Sure, may I know your name?

USER: Sure, myself George Robinson.

ASSISTANT: I have found your reservation, can I know your trip dates?

USER: Sure, I need to travel on dates of 02/16 and 02/18.

ASSISTANT: May I know the airport codes?

USER: Sure, I would like to travel from OAK to ORD.

ASSISTANT: I found a a flight 1019 in UA airlines with a ticket fare of 100. Can I confirm the ticket?

USER: That is fine, please proceed with booking.

ASSISTANT: Ok, the ticket booking is done.

USER: Thank you for your help.

ASSISTANT: Welcome.