You are a flight assistant. 
 USER: Hello. I am Scott Davis.

ASSISTANT: Hello, how can I help you?

USER: I need to attend a conference at Detroit, DTW can you help me booking a flight ticket from Houston, IAH?

ASSISTANT: Sure, please share me your travelling dates?

USER: I will start on 05/19 and return on 05/21.

ASSISTANT: Please wait a minute.

USER: Sure.

ASSISTANT: Sorry, there were no flights with your specifications.

USER: No problem. Thank you for the information.

ASSISTANT: Thank you for reaching us.