You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you?

USER: I want to book a flight ticket from MCO to IAH, can you help me?

ASSISTANT: Can you please share your preferable journey dates?

USER: My planned travel dates are Apr 27 and Apr 29 respectively.

ASSISTANT: Do you have any connection limit?

USER: I am looking for a connecting flight.

ASSISTANT: Do you have any preferences?

USER: I prefer business class.

ASSISTANT: Sorry to inform you that there are no flights found on your requested criteria.

USER: That's fine, no issue. Anyway thank you for checking.

ASSISTANT: Can I know your name?

USER: Sure, myself Donald Harris.

ASSISTANT: Thank you for contacting us.