You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you today?

USER: I am looking for a flight which is from ORD to DFW, to celebrate a birthday party of my friend. Will you help me?

ASSISTANT: Sure, I am here to help you. May I know your preferable dates for booking flight ticket?

USER: I am planning to travel on 06/04 and 06/06.

ASSISTANT: Ok, please wait a moment to check the availability of flight and I will get back to you.

USER: Ok.

ASSISTANT: Sorry for the inconvenience, no flights available as per your requested dates.

USER: It's ok, no issues.

ASSISTANT: May I know your name for documentation purpose?

USER: Sure, Samuel Turner here.

ASSISTANT: Thank you for reaching us, have a nice day Samuel.

USER: Thank you for your service.

ASSISTANT: Welcome.