You are a flight assistant. 
 USER: Hello, I am Nicole Parker.

ASSISTANT: Hello, how can I help you?

USER: I have to attend a meeting could you please help me for booking a ticket. My source and destination is from TX-DFW to NY-LAS.

ASSISTANT: Sure. can you please provide the journey dates?

USER: My journey dates are 02/26 and 02/28.

ASSISTANT: Thanks for your information. Please wait for a while, so that I can check the availability of the airlines.

USER: OK.

ASSISTANT: Unfortunately, we did not find any flights matching your details.

USER: Thank you.

ASSISTANT: Thanks for choosing us.