You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I be of your service?

USER: I am planning to celebrate my birthday at Houston, will you help me in booking the flight ticket from MCO to HOU?

ASSISTANT: Sure, we are mirthful to assist you in booking. Please let me know your planned travelling dates to proceed further.

USER: Thank you for accepting my request. My travelling dates are July 31 and Aug 01.

ASSISTANT: Please let me know if you need a connecting flight.

USER: I need a flight with single connection.

ASSISTANT: Kindly share if you have any class preference.

USER: No, but there is a change in my return date Aug 02.

ASSISTANT: Ok, may I know your name please?

USER: Myself mark Smith.

ASSISTANT: Is there any other preferences that you would like to add before booking?

USER: No, thank you for asking.

ASSISTANT: Ok, please wait a moment I'll check and revert to you.

USER: Ok, I will wait.

ASSISTANT: Thank you for waiting, we are unable to provide flight in between your journey routes due to some technical up-gradation at destination airport.

USER: Ok, not an issue. Thank you for your information.

ASSISTANT: Thank you for approaching us.