You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I provide assistance for you?

USER: I am Edward Miller. I am looking for a flight from SFO to DFW, can you help me in booking the flight ticket?

ASSISTANT: Sure, I am gleeful to help you. Could you please provide your travelling dates to search for the flight?

USER: I planned to airborne on 04/19 and I want to take return flight on 04/21.

ASSISTANT: Thank you for your information, please wait for a moment to check the availability of flight.

USER: My pleasure, take your own time to check the enhanced flight in your route.

ASSISTANT: Sorry to say, no flights were found on your route.

USER: That's ok, no problem. I will try any other source to reach my destination on time. Thank you for your information.

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