You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. May I know how best I can help you today?

USER: I am planning to visit Houston, will you help me in booking the flight ticket from HOU to IAH?

ASSISTANT: Sure, I am happy to help you in booking. Please share your planned travelling dates to proceed further.

USER: My preferable journey dates are Apr 17 and Apr 19.

ASSISTANT: Would you like to travel in a connecting flight or a direct flight?

USER: I need a flight with single connection.

ASSISTANT: May I know your name please?

USER: Myself Stephen Davis.

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

USER: No, I didn't have any other specifications?

ASSISTANT: Let me check the availability of flights and revert to you.

USER: Sure, I will wait.

ASSISTANT:   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.

ASSISTANT: Thank you for approaching us.

USER: Thank you for your information.