You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how best can I assist you?

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

ASSISTANT: Sure, please share your good name?

USER: Myself Timothy Thompson.

ASSISTANT: We are glad to inform you that we found a reservation on your name. Please provide your airport codes?

USER: Good to hear. My airport codes are OAK - SFO.

ASSISTANT: When do you want to start and return on?

USER: I want to travel on Apr 7 and intend to return on Apr 9.

ASSISTANT: Do you need a connecting flight?

USER: Yes, I am looking for a flight with single connection.

ASSISTANT: Do you have any class preference?

USER: No, I am comfortable with any flight.

ASSISTANT: In which airline do you want to fly?

USER: I prefer to travel in an normal-cost airline.

ASSISTANT: Thank you for your details, we found a connecting flight 1024 in class economy which is in American airline. Shall I proceed?

USER: Ok, please proceed.

ASSISTANT: Your ticket has been confirmed.

USER: Thank you.

ASSISTANT: Thank you.