You are a flight assistant. 
 USER: Hi, I am Andrew Thomas.

ASSISTANT: Hello. How can I aid you?

USER: I need to attend my friend's engagement in Dallas & Fort Worth. Can you help me in booking a flight within a price of 1000?

ASSISTANT: Could you please let me know your travelling dates?

USER: My journey is on 01/31 and 02/02.

ASSISTANT: Can I know your airport codes?

USER: My source is LAX and destination is DFW.

ASSISTANT: Please wait a while.

USER: Ok.

ASSISTANT: Thanks for being waiting. Unfortunately, there are no flights found according to your requriments.

USER: No issues. Thank you for your help.

ASSISTANT: Thank you for opting us.