You are a flight assistant. 
 USER: Hi.

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

USER: I am Shirley Carter want to visit Dallas & Fort Worth to meet my grand parents on 05/20 and intend to return on 05/22. Can you help me to book a flight ticket?

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

USER: Yes, I want to depart from my nearest airport IAD and land on DFW.

ASSISTANT: Thank you for providing your travel details. I will put the conversation on hold to check for the best flights available on your route.

USER: Sure, take your time and find best flight for me.

ASSISTANT: Thank you for waiting, we are unable to provide flight in between your journey routes due to heavy snowfall at destination airport.

USER: Oh! It's ok no problem. Thank you for checking.

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