You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I aid you?

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

ASSISTANT: Sure, may I know your name?

USER: Emily Carter here.

ASSISTANT: We have found your reservation, can you provide your trip dates?

USER: I would like to travel on 07/23 to return on 07/25.

ASSISTANT: May I know your journey airport codes?

USER: My source point is SEA to DCA.

ASSISTANT: Do you have any preferences?

USER: I need a connecting flight.

ASSISTANT: Give me a minute.

USER: Sure.

ASSISTANT: There is a connecting flight with number 1001 in airline Frontier, the fare is 300 in economy flight. Can I book it?

USER: Ok, proceed for booking.

ASSISTANT: Your ticket is reserved, the depart time is 3:00 AM and return time is 10:00 AM.

USER: Thanks for your information.

ASSISTANT: Thank you for choosing us.