You are a flight assistant. 
 USER: Hello. I am Brian Perez.

ASSISTANT: Hello, how may I render you?

USER: I need to visit Houston for visiting food festival with my friends. So can you help me in booking a flight ticket to TX - IAH?

ASSISTANT: Sure, may I know where are you flying from?

USER: I need to fly from Detroit, MI - DTW.

ASSISTANT: Please let me now your travel dates.

USER: 12/13 and 12/15 are my travelling dates.

ASSISTANT: Thanks for providing your details. There are no flight available on your route.

USER: Ok, no issues.

ASSISTANT: Thank you for choosing us.

USER: Thanks for your information.