You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you?

USER: I want to change my existing reservation owing to an emergency.

ASSISTANT: Sure, may I know your name?

USER: My name is Dennis Hill.

ASSISTANT: Please wait.

USER: Sure.

ASSISTANT: We found your reservation, please tell me your new airport codes?

USER: Airport codes IAD and SEA.

ASSISTANT: May I know your travelling dates?

USER: Travelling dates are from Oct, 18 till Oct, 20.

ASSISTANT: Is there any connection limit?

USER: I prefer connecting flight.

ASSISTANT: Do you have any other specifications?

USER: I would like to return in the afternoon time.

ASSISTANT: Ok, please wait.

USER: Sure.

ASSISTANT: We found a connecting flight of american airlines in the economy class with fare 100, can I proceed for booking?

USER: Please book a flight.

ASSISTANT: Your ticket is confirmed with flight number 1026.

USER: Thank you.

ASSISTANT: Thank you for reaching us.