You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello\. How can I aid you?

USER: I am Lisa Robinson. I want to  book a flight ticket to attend a party at  MI-DTW from TX-IAH. Can you help me?

ASSISTANT: Sure, may I know your journey dates?

USER: 10/02 and 10/04 are my travelling dates.

ASSISTANT: Ok, please wait a moment. Sorry to inform you that there is no flight available on your route.

USER: NO issue. Thank you for your help.

ASSISTANT: Thank you for contacting us.