You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. Do you need any help from my side?

USER: I want to change my existing reservation due to sudden rainfall at my source. Can you please help me with this?

ASSISTANT: Sure, I am glad to help you and can I know your name please?

USER: Sure, my name is Robert Thomas.

ASSISTANT: I have found your reservation and can I know your airport codes please?

USER: Sure, my airport codes are LAS - IAD.

ASSISTANT: Can I know your preferable travel dates?

USER: I want to travel on Dec 14 and need to return on Dec 16.

ASSISTANT: Is there any connection preference?

USER: Yes, I need a connecting flight.

ASSISTANT: Do you have any other preferences?

USER: Yes, I need an normal-cost airline flight which depart in the afternoon time.

ASSISTANT:  I have checked with your details, there is a flight 1000 in Delta airlines which is one of the best airways providing a flight for you with a 1 stop in your journey, can I confirm your flight ticket booking?

USER: Ok, please make it confirm.

ASSISTANT: Your flight ticket booking is done in the above flight for your journey.

USER: Thank you.

ASSISTANT: You are most welcome and thank you for approaching us.