You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Sharon Evans here.

ASSISTANT: How may I aid you?

USER: Please book a flight ticket from Houston to New York.

ASSISTANT: May I know your airport codes please?

USER: My origin and destination airport codes are IAH and LGA.

ASSISTANT: Please provide your planned trip dates.

USER: My itinerary dates are 08/07 and 08/09.

ASSISTANT: Please wait a moment.

USER: Sure.

ASSISTANT: Evans, no flights has been found on your journey dates.

USER: No problem, I will find an alternative way to travel.

ASSISTANT: Thank you for choosing us.

USER: Thank you for your help.