You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you at this moment?

USER: I am Scott Lewis. Can you please book a flight ticket from SFO to IAH?

ASSISTANT: Sure, I am happy to help you with that. Can you please tell me your class preference?

USER: I would prefer economy class this time.

ASSISTANT: Ok, do you have any connection limit preference?

USER: I am looking for direct flight so please check for that.

ASSISTANT: Ok, can you please share your travel dates?

USER: I have planned my travel dates as Mar 09 and Mar 11.

ASSISTANT: Sorry to inform you that, there are no direct flights found in this route on the dates you have given.

USER: It's ok, I will choose another agency this time. Anyway, thank you for your time.

ASSISTANT: You are welcome. Thank you for reaching us.

USER: Most welcome.