You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Larry Walker.

ASSISTANT: How may I serve you at this moment?

USER: I need to change my existing reservation as my exams got postponed, Can you please help me with that?

ASSISTANT: Sure, I am here to help you. Please wait for few minutes.

USER: Sure.

ASSISTANT: We found a existing reservation on your name. Could you please share your new departure and arrival dates?

USER: I would like to travel on 01/25 to return on 01/27.

ASSISTANT: Ok, may I know your travelling airport codes?

USER: My source point is IAD and destination point is AUS.

ASSISTANT: Do you need any halt in between the journey?

USER: I need a connecting flight.

ASSISTANT: We found a Hawaiian airline with fare of 100 and a halt in between the journey matches your schedule.

USER: Ok, proceed for booking.

ASSISTANT: Your ticket has been confirmed with flight number 1015.

USER: Thanks for your information.

ASSISTANT: Thank you for connecting with us.