You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Shirley Baker.

ASSISTANT: How may I assist you?

USER: I want to book a flight ticket from TX-AUS to CO-DEN. Can you help me?

ASSISTANT: Sure, I will help you. When are you planning to start your journey?

USER: I would like to start on 05/19 .

ASSISTANT: How much should be your ticket fare?

USER: 500 is my fare.

ASSISTANT: Let me know your return date.

USER: 05/21 will be my return.

ASSISTANT: Thank you for sharing the details. Unfortunately, there are no flights available that matches your requirements.

USER: No issue. Thank you.

ASSISTANT: Thank you for approaching us.