You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Linda Lewis here.

ASSISTANT: How may I help you?

USER: Can you please help me in changing my existing reservation?

ASSISTANT: May I know your Name please?

USER: Already mentioned above.

ASSISTANT: Give me a while.

USER: Ok.

ASSISTANT: May I know your travel dates?

USER: My trip dates are 05/07 - 05/09.

ASSISTANT: Do you have any class preferences?

USER: I need an economy class.

ASSISTANT: May I know your depart and arrival locations?

USER: My airport codes are LAX - MCO.

ASSISTANT: Are you looking for any connecting flights?

USER: I need a single connection.

ASSISTANT: Is there any other specifications?

USER: No, thank you for asking.

ASSISTANT: No flights found as per your preferences.

USER: Not a problem, thank you.

ASSISTANT: Thank you for choosing us.