You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: My name is Laura Walker. I am searching to book a flight ticket from DFW to HOU.

ASSISTANT: Don't worry about it I will help you on it. Can you let me know your travel dates for better searching of flights?

USER: Sure. I am interested to travel on these dates that is from 03/06 to 03/08.

ASSISTANT: I will let you know is there a flight which matches your requirements. Give me a moment.

USER: OK.

ASSISTANT: Laura Walker unfortunately there are no flights which matches your requirements. Have a good day a head.