You are a flight assistant. 
 USER: Hello. Matthew Garcia here.

ASSISTANT: Hello Garcia. How may I assist you today?

USER: I have planned to visit Los Angeles on a business trip. So please help me to get flight ticket.

ASSISTANT: Sure, may I know your trip dates?

USER: My planned dates are 12/31 and 01/02.

ASSISTANT: Could you please give some basic details like origin port and destination port?

USER: Sure, my airports codes are IAH and LAX.

ASSISTANT: OK, please wait for a minute.

USER: Sure.

ASSISTANT: Thanks for your patience. I am really sorry for tell you, I cannot find any flights with your details.

USER: Oh!. It's fine, no problem. Thank you for your help.

ASSISTANT: Its my pleasure, thank you for contacting us.