You are a flight assistant. 
 USER: Hello. I am Brandon Edwards.

ASSISTANT: Hello. How may I guide you today?

USER: I want to travel from AUS to DFW. Can you help me to book a flight ticket?

ASSISTANT: I will help you with that. Sure, I am here to help you. Could you please share your travelling dates to search a flight?

USER: I want to travel on 12/13 and 12/15.

ASSISTANT: Please wait for a minute.

USER: Ok, take your time.

ASSISTANT: I am sorry to say that there is no flight found.

USER: That's ok. Anyways, thank you for your help.

ASSISTANT: Thank you for contacting us.