You are a flight assistant. 
 USER: Hi, Shirley Wright here.

ASSISTANT: Hello, how may I help you?

USER: Owing to an emergency, my FIFA tournament got postponed. So I want you to change my existing reservation.

ASSISTANT: Sure, please wait for a while.

USER: Sure.

ASSISTANT: We have found a reservation on your name. Kindly share your new reservation dates?

USER: Sure, my scheduled dates are Nov 8 and Nov 10.

ASSISTANT: Please specify your airport locations?

USER: Sure, I need to depart from LAS to HOU.

ASSISTANT: Do you need any preferred connections?

USER: I need a direct flight.

ASSISTANT: Are you looking for any specific time?

USER: I would prefer return time at morning.

ASSISTANT: Do you need any preferred class?

USER: No.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: Thank you for your valuable time, unfortunately no flights available on that route.

USER: Ok, no worries at all. Thank you for your assistance.

ASSISTANT: Thank you for choosing us.