You are a flight assistant. 
 USER: Hi, Christine Lopez here.

ASSISTANT: Hello. How can I help you today?

USER: As I am a Doctor, I have an emergency surgery at Dallas & Fort Worth, so I need to book a direct flight.

ASSISTANT: Ok. I will help you.

USER: Thank you.

ASSISTANT: Can I have your travelling dates?

USER: Sure, I am willing to travel on 03/09 to 03/11.

ASSISTANT: Please send the airport codes.

USER: My airport codes are LGA - DFW.

ASSISTANT: Ok, please hold on.

USER: Sure.

ASSISTANT: Thanks for waiting. But, we did not find any flight that runs on the respective dates.

USER: No problem, thanks for your information.

ASSISTANT: Thank you.