You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am John Rodriguez.

ASSISTANT: How may I help you today?

USER: Me and my friend were planned a trip to DFW. The ticket is confirmed for my friend but due to some technical issues my ticket is not yet confirmed, so can you reserve a flight ticket again to me from IAH?

ASSISTANT: Sure, I am happy to help you.

USER: Thank you.

ASSISTANT: Ok, may I know your travelling dates?

USER: I would like to board on 03/29 and catch the return flight on 03/31.

ASSISTANT: Sorry John, no flight's available based on your travelling dates.

USER: Ok, that's fine. Thank you for your help.

ASSISTANT: Thank you for reaching us.