You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. Can you please tell me how may I guide you?

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

ASSISTANT: Sure, I am happy to help you to book a flight ticket. Can you please provide me your planned trip dates?

USER: My travelling dates are Oct 20 and Oct 22.

ASSISTANT: Ok, is there any preference related to connection limit?

USER: I need a connecting flight.

ASSISTANT: Ok, please share your other requirements if any.

USER: I need a economy class.

ASSISTANT: May I know your good name please?

USER: Myself Ashley Walker.

ASSISTANT: Ok, please hold on for a while. I will check the flight availability and get back to you.

USER: ok, I will wait.

ASSISTANT: Sorry to intimate you that, there is no flight found with the dates you have given.

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

ASSISTANT: That's my pleasure, thank you for contacting our agency.